diff --git a/src/rules/no-duplicate-dollar-variables/README.md b/src/rules/no-duplicate-dollar-variables/README.md
index e8f0a2ca..4a038601 100644
--- a/src/rules/no-duplicate-dollar-variables/README.md
+++ b/src/rules/no-duplicate-dollar-variables/README.md
@@ -33,7 +33,23 @@ $a: 1;
 }
 ```
 
-The following patterns are *not* considered violations:
+```scss
+$a: 1;
+.b {
+  .c {
+    $a: 1;
+  }
+}
+```
+
+```scss
+$a: 1;
+@mixin b {
+  $a: 1;
+}
+```
+
+The following patterns are _not_ considered violations:
 
 ```scss
 $a: 1;
@@ -46,3 +62,82 @@ $a: 1;
   $b: 2;
 }
 ```
+
+### `ignoreInside: ["at-rule", "nested-at-rule"]`
+
+#### `"at-rule"`
+
+Ignores dollar variables that are inside both nested and non-nested at-rules (`@media`, `@mixin`, etc.).
+
+Given:
+
+```json
+{ "ignoreInside": ["at-rule"] }
+```
+
+The following patterns are _not_ considered warnings:
+
+```scss
+$a: 1;
+@mixin c {
+  $a: 1;
+}
+```
+
+```scss
+$a: 1;
+.b {
+  @mixin c {
+    $a: 1;
+  }
+}
+```
+
+#### `"nested-at-rule"`
+
+Ignores dollar variables that are inside nested at-rules (`@media`, `@mixin`, etc.).
+
+Given:
+
+```json
+{ "ignoreInside": ["nested-at-rule"] }
+```
+
+The following patterns are _not_ considered warnings:
+
+```scss
+$a: 1;
+.b {
+  @mixin c {
+    $a: 1;
+  }
+}
+```
+
+### `ignoreInsideAtRules: ["array", "of", "at-rules"]`
+
+Ignores all variables that are inside specified at-rules.
+
+Given:
+
+```json
+{ "ignoreInsideAtRules": ["if", "mixin"] }
+```
+
+The following patterns are _not_ considered warnings:
+
+```scss
+$a: 1;
+
+@mixin b {
+  $a: 2;
+}
+```
+
+```scss
+$a: 1;
+
+@if (true) {
+  $a: 2;
+}
+```
diff --git a/src/rules/no-duplicate-dollar-variables/__tests__/index.js b/src/rules/no-duplicate-dollar-variables/__tests__/index.js
index 98d713d2..d4b76380 100644
--- a/src/rules/no-duplicate-dollar-variables/__tests__/index.js
+++ b/src/rules/no-duplicate-dollar-variables/__tests__/index.js
@@ -52,7 +52,8 @@ testRule(rule, {
         $b: 2;
       }
     `,
-      description: "Two dollar variables with different names and nesting."
+      description:
+        "Two dollar variables with different names and inside a selector."
     },
     {
       code: `
@@ -138,7 +139,54 @@ testRule(rule, {
       line: 4,
       column: 9,
       message: messages.rejected("$ab"),
-      description: "Two dollar variables with the same name and nesting."
+      description:
+        "Two dollar variables with the same name and inside a selector."
+    },
+    {
+      code: `
+      $ab: 1;
+      .b {
+        @mixin c {
+          $ab: 2;
+        }
+      }
+    `,
+      line: 5,
+      column: 11,
+      message: messages.rejected("$ab"),
+      description: "Two dollar variables with the same name and nested @mixin."
+    },
+    {
+      code: `
+      $ab: 1;
+      .b {
+        & {
+          $ab: 2;
+        }
+      }
+    `,
+      line: 5,
+      column: 11,
+      message: messages.rejected("$ab"),
+      description:
+        "Two dollar variables with the same name and nesting selector."
+    },
+    {
+      code: `
+      $a: blue;
+      @mixin foo {
+        $a: red;
+        color: $a;
+      }
+      .b {
+        color: $a;
+        @include foo;
+      }
+    `,
+      line: 4,
+      column: 9,
+      message: messages.rejected("$a"),
+      description: "Two dollar variables with the same name and @mixin."
     },
     {
       code: `
@@ -177,3 +225,669 @@ testRule(rule, {
     }
   ]
 });
+
+testRule(rule, {
+  ruleName,
+  config: [true, { ignoreInside: "at-rule" }],
+  syntax: "scss",
+
+  accept: [
+    {
+      code: `
+      $a: 1;
+
+      .a {
+        @mixin {
+          $a: 2;
+        }
+      }
+    `,
+      description: "Should ignore inside nested @mixin."
+    },
+    {
+      code: `
+      $ab: 1;
+      @mixin b {
+        $ab: 2;
+      }
+    `,
+      description: "Two dollar variables with the same name and inside @mixin."
+    },
+    {
+      code: `
+      $a: 1;
+
+      .a {
+        .b .c {
+          @media (max-width: 500px) {
+            $a: 2;
+          }
+        }
+      }
+    `,
+      description: "Should ignore inside nested @media query."
+    },
+    {
+      code: `
+      $a: 1;
+    `,
+      description: "A single dollar variable."
+    },
+    {
+      code: `
+      $a: 1;
+      $b: 2;
+    `,
+      description: "Two dollar variables with different names."
+    },
+    {
+      code: `
+      $a: 1; $b: 2;
+    `,
+      description: "Two dollar variables with different names on the same line."
+    },
+    {
+      code: "a { $a: 0; $b: $a + 1; }",
+      description:
+        "Two dollar variables with different names on the same line and variable assign."
+    },
+    {
+      code: "a { @less: 0; @less: @less + 1; }",
+      description: "Less variables are ignored"
+    },
+    {
+      code: "a { --custom-property: 0; --custom-property: 1; }",
+      description: "Custom properties are ignored"
+    },
+    {
+      code: `
+      $a: 1;
+      $ab: 2;
+    `,
+      description: "Two dollar variables with different names."
+    },
+    {
+      code: `
+      $a: 1;
+      .b {
+        $b: 2;
+      }
+    `,
+      description: "Two dollar variables with different names and nesting."
+    },
+    {
+      code: `
+      $a: 1;
+      .b {
+        color: black;
+      }
+    `,
+      description: "A single variable and a normal CSS property."
+    }
+  ],
+
+  reject: [
+    {
+      code: `
+      $a: 1;
+
+      .a {
+        .b {
+          $a: 2;
+        }
+      }
+    `,
+      line: 6,
+      column: 11,
+      message: messages.rejected("$a"),
+      description: "Should warn inside nested selector."
+    },
+    {
+      code: `
+      $a: 1;
+
+      .a {
+        & {
+          $a: 2;
+        }
+      }
+    `,
+      line: 6,
+      column: 11,
+      message: messages.rejected("$a"),
+      description: "Should warn inside nesting selector."
+    },
+
+    {
+      code: `
+      $a: 1;
+      $b: 2;
+
+      .a {
+        $b: 3;
+        .b {
+          $a: 2;
+        }
+      }
+    `,
+      line: 6,
+      column: 9,
+      message: messages.rejected("$b"),
+      description:
+        "Should warn for a var inside the selector, but not for nested one."
+    },
+    {
+      code: `
+      $a: 1;
+      $a: 2;
+    `,
+      line: 3,
+      column: 7,
+      message: messages.rejected("$a"),
+      description: "Two dollar variables with the same name."
+    },
+    {
+      code: `
+      $a: 1; $a: 2;
+    `,
+      line: 2,
+      column: 14,
+      message: messages.rejected("$a"),
+      description: "Two dollar variables with the same name on the same line."
+    },
+    {
+      code: `
+      $a: 1;
+      $a: 2;
+      $a: 1;
+    `,
+      line: 3,
+      column: 7,
+      message: messages.rejected("$a"),
+      description: "Three dollar variables with the same name."
+    },
+    {
+      code: "a { $scss: 0; $scss: $scss + 1; }",
+      line: 1,
+      column: 15,
+      message: messages.rejected("$scss"),
+      description: "Two dollar variables with the same name inside a selector."
+    },
+    {
+      code: `
+      $a: 1;
+      $b: 2;
+      $a: 3;
+    `,
+      line: 4,
+      column: 7,
+      message: messages.rejected("$a"),
+      description: "Two dollar variables with the same name, variable between."
+    },
+    {
+      code: `
+      $a: 1;
+
+      $b: 2;
+
+      $a: 3;
+    `,
+      line: 6,
+      column: 7,
+      message: messages.rejected("$a"),
+      description:
+        "Two dollar variables with the same name, variable and newlines between."
+    },
+    {
+      code: `
+      $ab: 1;
+      .b {
+        $ab: 2;
+      }
+    `,
+      line: 4,
+      column: 9,
+      message: messages.rejected("$ab"),
+      description:
+        "Two dollar variables with the same name and inside a selector."
+    }
+  ]
+});
+
+testRule(rule, {
+  ruleName,
+  config: [true, { ignoreInside: "nested-at-rule" }],
+  syntax: "scss",
+
+  accept: [
+    {
+      code: `
+      $a: 1;
+
+      .a {
+        @mixin {
+          $a: 2;
+        }
+      }
+    `,
+      description: "Should ignore inside nested @mixin."
+    },
+    {
+      code: `
+      $a: 1;
+
+      .a {
+        .b .c {
+          @media (max-width: 500px) {
+            $a: 2;
+          }
+        }
+      }
+    `,
+      description: "Should ignore inside nested @media query."
+    },
+    {
+      code: `
+      $a: 1;
+    `,
+      description: "A single dollar variable."
+    },
+    {
+      code: `
+      $a: 1;
+      $b: 2;
+    `,
+      description: "Two dollar variables with different names."
+    },
+    {
+      code: `
+      $a: 1; $b: 2;
+    `,
+      description: "Two dollar variables with different names on the same line."
+    },
+    {
+      code: "a { $a: 0; $b: $a + 1; }",
+      description:
+        "Two dollar variables with different names on the same line and variable assign."
+    },
+    {
+      code: "a { @less: 0; @less: @less + 1; }",
+      description: "Less variables are ignored"
+    },
+    {
+      code: "a { --custom-property: 0; --custom-property: 1; }",
+      description: "Custom properties are ignored"
+    },
+    {
+      code: `
+      $a: 1;
+      $ab: 2;
+    `,
+      description: "Two dollar variables with different names."
+    },
+    {
+      code: `
+      $a: 1;
+      .b {
+        $b: 2;
+      }
+    `,
+      description: "Two dollar variables with different names and nesting."
+    },
+    {
+      code: `
+      $a: 1;
+      .b {
+        color: black;
+      }
+    `,
+      description: "A single variable and a normal CSS property."
+    }
+  ],
+
+  reject: [
+    {
+      code: `
+      $a: 1;
+
+      .a {
+        .b {
+          $a: 2;
+        }
+      }
+    `,
+      line: 6,
+      column: 11,
+      message: messages.rejected("$a"),
+      description: "Should warn inside nested selector."
+    },
+    {
+      code: `
+      $a: 1;
+
+      .a {
+        & {
+          $a: 2;
+        }
+      }
+    `,
+      line: 6,
+      column: 11,
+      message: messages.rejected("$a"),
+      description: "Should warn inside nesting selector."
+    },
+
+    {
+      code: `
+      $a: 1;
+      $b: 2;
+
+      .a {
+        $b: 3;
+        .b {
+          $a: 2;
+        }
+      }
+    `,
+      line: 6,
+      column: 9,
+      message: messages.rejected("$b"),
+      description:
+        "Should warn for a var inside the selector, but not for nested one."
+    },
+    {
+      code: `
+      $a: 1;
+      $a: 2;
+    `,
+      line: 3,
+      column: 7,
+      message: messages.rejected("$a"),
+      description: "Two dollar variables with the same name."
+    },
+    {
+      code: `
+      $a: 1; $a: 2;
+    `,
+      line: 2,
+      column: 14,
+      message: messages.rejected("$a"),
+      description: "Two dollar variables with the same name on the same line."
+    },
+    {
+      code: `
+      $a: 1;
+      $a: 2;
+      $a: 1;
+    `,
+      line: 3,
+      column: 7,
+      message: messages.rejected("$a"),
+      description: "Three dollar variables with the same name."
+    },
+    {
+      code: "a { $scss: 0; $scss: $scss + 1; }",
+      line: 1,
+      column: 15,
+      message: messages.rejected("$scss"),
+      description: "Two dollar variables with the same name inside a selector."
+    },
+    {
+      code: `
+      $a: 1;
+      $b: 2;
+      $a: 3;
+    `,
+      line: 4,
+      column: 7,
+      message: messages.rejected("$a"),
+      description: "Two dollar variables with the same name, variable between."
+    },
+    {
+      code: `
+      $a: 1;
+
+      $b: 2;
+
+      $a: 3;
+    `,
+      line: 6,
+      column: 7,
+      message: messages.rejected("$a"),
+      description:
+        "Two dollar variables with the same name, variable and newlines between."
+    },
+    {
+      code: `
+      $ab: 1;
+      .b {
+        $ab: 2;
+      }
+    `,
+      line: 4,
+      column: 9,
+      message: messages.rejected("$ab"),
+      description:
+        "Two dollar variables with the same name and inside a selector."
+    },
+    {
+      code: `
+      $ab: 1;
+      @mixin b {
+        $ab: 2;
+      }
+    `,
+      line: 4,
+      column: 9,
+      message: messages.rejected("$ab"),
+      description: "Two dollar variables with the same name and inside @mixin."
+    }
+  ]
+});
+
+testRule(rule, {
+  ruleName,
+  config: [true, { ignoreInsideAtRules: ["if", "mixin"] }],
+  syntax: "scss",
+
+  accept: [
+    {
+      code: `
+      $a: 1;
+
+      @mixin b {
+        $a: 2;
+      }
+    `,
+      description: "Should ignore inside @mixin."
+    },
+    {
+      code: `
+      $a: 1;
+
+      .a {
+        .b {
+          @mixin c {
+            $a: 2;
+          }
+        }
+      }
+
+    `,
+      description: "Should ignore inside nested @mixin."
+    },
+    {
+      code: `
+      $a: 1;
+
+      @if (true) {
+        $a: 2;
+      }
+    `,
+      description: "Should ignore inside @if."
+    },
+    {
+      code: `
+      $a: 1;
+    `,
+      description: "A single dollar variable."
+    },
+    {
+      code: `
+      $a: 1;
+      $b: 2;
+    `,
+      description: "Two dollar variables with different names."
+    },
+    {
+      code: `
+      $a: 1; $b: 2;
+    `,
+      description: "Two dollar variables with different names on the same line."
+    },
+    {
+      code: "a { $a: 0; $b: $a + 1; }",
+      description:
+        "Two dollar variables with different names on the same line and variable assign."
+    },
+    {
+      code: "a { @less: 0; @less: @less + 1; }",
+      description: "Less variables are ignored"
+    },
+    {
+      code: "a { --custom-property: 0; --custom-property: 1; }",
+      description: "Custom properties are ignored"
+    },
+    {
+      code: `
+      $a: 1;
+      $ab: 2;
+    `,
+      description: "Two dollar variables with different names."
+    },
+    {
+      code: `
+      $a: 1;
+      .b {
+        $b: 2;
+      }
+    `,
+      description:
+        "Two dollar variables with different names and inside a selector."
+    },
+    {
+      code: `
+      $a: 1;
+      .b {
+        color: black;
+      }
+    `,
+      description: "A single variable and a normal CSS property."
+    }
+  ],
+  reject: [
+    {
+      code: `
+      $c: 1;
+
+      @function b() {
+        $c: 2;
+      }
+    `,
+      line: 5,
+      column: 9,
+      message: messages.rejected("$c"),
+      description: "Should warn inside @function as it is not ignored."
+    },
+    {
+      code: `
+      $a: 1;
+      $a: 2;
+    `,
+      line: 3,
+      column: 7,
+      message: messages.rejected("$a"),
+      description: "Two dollar variables with the same name."
+    },
+    {
+      code: `
+      $a: 1; $a: 2;
+    `,
+      line: 2,
+      column: 14,
+      message: messages.rejected("$a"),
+      description: "Two dollar variables with the same name on the same line."
+    },
+    {
+      code: `
+      $a: 1;
+      $a: 2;
+      $a: 1;
+    `,
+      line: 3,
+      column: 7,
+      message: messages.rejected("$a"),
+      description: "Three dollar variables with the same name."
+    },
+    {
+      code: "a { $scss: 0; $scss: $scss + 1; }",
+      line: 1,
+      column: 15,
+      message: messages.rejected("$scss"),
+      description: "Two dollar variables with the same name inside a selector."
+    },
+    {
+      code: `
+      $a: 1;
+      $b: 2;
+      $a: 3;
+    `,
+      line: 4,
+      column: 7,
+      message: messages.rejected("$a"),
+      description: "Two dollar variables with the same name, variable between."
+    },
+    {
+      code: `
+      $a: 1;
+
+      $b: 2;
+
+      $a: 3;
+    `,
+      line: 6,
+      column: 7,
+      message: messages.rejected("$a"),
+      description:
+        "Two dollar variables with the same name, variable and newlines between."
+    },
+    {
+      code: `
+      $ab: 1;
+      .b {
+        $ab: 2;
+      }
+    `,
+      line: 4,
+      column: 9,
+      message: messages.rejected("$ab"),
+      description:
+        "Two dollar variables with the same name and inside a selector."
+    },
+    {
+      code: `
+      $ab: 1;
+      .b {
+        & {
+          $ab: 2;
+        }
+      }
+    `,
+      line: 5,
+      column: 11,
+      message: messages.rejected("$ab"),
+      description:
+        "Two dollar variables with the same name and nesting selector."
+    }
+  ]
+});
diff --git a/src/rules/no-duplicate-dollar-variables/index.js b/src/rules/no-duplicate-dollar-variables/index.js
index 72fb85da..ce8698f8 100644
--- a/src/rules/no-duplicate-dollar-variables/index.js
+++ b/src/rules/no-duplicate-dollar-variables/index.js
@@ -1,4 +1,5 @@
 import { utils } from "stylelint";
+import { isString } from "lodash";
 import { namespace } from "../../utils";
 
 export const ruleName = namespace("no-duplicate-dollar-variables");
@@ -7,11 +8,23 @@ export const messages = utils.ruleMessages(ruleName, {
   rejected: variable => `Unexpected duplicate dollar variable ${variable}`
 });
 
-export default function(value) {
+export default function(value, secondaryOptions) {
   return (root, result) => {
-    const validOptions = utils.validateOptions(result, ruleName, {
-      actual: value
-    });
+    const validOptions = utils.validateOptions(
+      result,
+      ruleName,
+      {
+        actual: value
+      },
+      {
+        actual: secondaryOptions,
+        possible: {
+          ignoreInside: ["at-rule", "nested-at-rule"],
+          ignoreInsideAtRules: [isString]
+        },
+        optional: true
+      }
+    );
 
     if (!validOptions) {
       return;
@@ -20,7 +33,30 @@ export default function(value) {
     const vars = {};
 
     root.walkDecls(decl => {
-      if (decl.prop[0] !== "$") {
+      const isVar = decl.prop[0] === "$";
+      const isInsideIgnoredAtRule =
+        decl.parent.type === "atrule" &&
+        secondaryOptions &&
+        secondaryOptions.ignoreInside &&
+        secondaryOptions.ignoreInside === "at-rule";
+      const isInsideIgnoredNestedAtRule =
+        decl.parent.type === "atrule" &&
+        decl.parent.parent.type !== "root" &&
+        secondaryOptions &&
+        secondaryOptions.ignoreInside &&
+        secondaryOptions.ignoreInside === "nested-at-rule";
+      const isInsideIgnoredSpecifiedAtRule =
+        decl.parent.type === "atrule" &&
+        secondaryOptions &&
+        secondaryOptions.ignoreInsideAtRules &&
+        secondaryOptions.ignoreInsideAtRules.indexOf(decl.parent.name) > -1;
+
+      if (
+        !isVar ||
+        isInsideIgnoredAtRule ||
+        isInsideIgnoredNestedAtRule ||
+        isInsideIgnoredSpecifiedAtRule
+      ) {
         return;
       }