diff --git a/README.md b/README.md
index 0c8132c1b..9eb46ff62 100644
--- a/README.md
+++ b/README.md
@@ -487,6 +487,26 @@ Example configuration:
     */
     "disallowImplicitTypeConversion": ["numeric", "boolean", "binary", "string"],
 
+    /*
+        Option: requireCamelCaseOrUpperCaseIdentifiers
+        Requires identifiers to be camelCased or UPPERCASE_WITH_UNDERSCORES
+
+        Valid example:
+
+        var camelCase = 0;
+        var CamelCase = 1;
+        var _camelCase = 2;
+        var camelCase_ = 3;
+        var UPPER_CASE = 4;
+
+        Invalid examples:
+
+        var lower_case = 1;
+        var Mixed_case = 2;
+        var mixed_Case = 3;
+    */
+    "requireCamelCaseOrUpperCaseIdentifiers": true,
+
     /*
         Option: disallowKeywords
         Disallows usage of specified keywords.
@@ -617,7 +637,7 @@ Example configuration:
 
     /*
         Option: additionalRules
-        Pluggable rules 
+        Pluggable rules
     */
     "additionalRules": ["project-rules/*.js"],
 
diff --git a/lib/rules/require-camelcase-or-uppercase-identifiers.js b/lib/rules/require-camelcase-or-uppercase-identifiers.js
new file mode 100644
index 000000000..dab3c48b4
--- /dev/null
+++ b/lib/rules/require-camelcase-or-uppercase-identifiers.js
@@ -0,0 +1,40 @@
+var assert = require('assert');
+
+module.exports = function() {};
+
+module.exports.prototype = {
+
+    configure: function(requireCamelCaseOrUpperCaseIdentifiers) {
+        assert(
+            typeof requireCamelCaseOrUpperCaseIdentifiers === 'boolean',
+            'requireCamelCaseOrUpperCaseIdentifiers option requires boolean value'
+        );
+        assert(
+            requireCamelCaseOrUpperCaseIdentifiers === true,
+            'requireCamelCaseOrUpperCaseIdentifiers option requires true value or should be removed'
+        );
+    },
+
+    getOptionName: function () {
+        return 'requireCamelCaseOrUpperCaseIdentifiers';
+    },
+
+    check: function(file, errors) {
+        var tokens = file.getTokens();
+        errors = errors;
+        for (var i = 0, l = tokens.length; i < l; i++) {
+            var token = tokens[i];
+            if (token.type === 'Identifier') {
+                var value = token.value;
+                if (value.replace(/^_+|_+$/g, '').indexOf('_') > -1 && value.toUpperCase() !== value) {
+                    errors.add(
+                        'All identifiers must be camelCase or UPPER_CASE',
+                        token.loc.start.line,
+                        token.loc.start.column
+                    );
+                }
+            }
+        }
+    }
+
+};
diff --git a/lib/string-checker.js b/lib/string-checker.js
index aae1b5573..b5288b0ee 100644
--- a/lib/string-checker.js
+++ b/lib/string-checker.js
@@ -44,6 +44,7 @@ StringChecker.prototype = {
         /* deprecated rules (end) */
 
         this.registerRule(new (require('./rules/disallow-implicit-type-conversion'))());
+        this.registerRule(new (require('./rules/require-camelcase-or-uppercase-identifiers'))());
         this.registerRule(new (require('./rules/disallow-keywords'))());
         this.registerRule(new (require('./rules/disallow-multiple-line-breaks'))());
         this.registerRule(new (require('./rules/validate-line-breaks'))());
diff --git a/test/test.require-camelcase-or-uppercase-identifiers.js b/test/test.require-camelcase-or-uppercase-identifiers.js
new file mode 100644
index 000000000..d0e96c0d9
--- /dev/null
+++ b/test/test.require-camelcase-or-uppercase-identifiers.js
@@ -0,0 +1,44 @@
+var Checker = require('../lib/checker');
+var assert = require('assert');
+
+describe('rules/require-camelcase-or-uppercase-identifiers', function() {
+    var checker;
+
+    beforeEach(function() {
+        checker = new Checker();
+        checker.registerDefaultRules();
+        checker.configure({ requireCamelCaseOrUpperCaseIdentifiers: true });
+    });
+
+    it('should report inner all-lowercase underscores', function() {
+        assert(checker.checkString('var x_y = "x";').getErrorCount() === 1);
+    });
+
+    it('should report inner some-lowercase underscores', function() {
+        assert(checker.checkString('var X_y = "x";').getErrorCount() === 1);
+    });
+
+    it('should not report inner all-uppercase underscores', function() {
+        assert(checker.checkString('var X_Y = "x";').isEmpty());
+    });
+
+    it('should not report no underscores', function() {
+        assert(checker.checkString('var xy = "x";').isEmpty());
+    });
+
+    it('should not report leading underscores', function() {
+        assert(checker.checkString('var _x = "x", __y = "y";').isEmpty());
+    });
+
+    it('should report trailing underscores', function() {
+        assert(checker.checkString('var x_ = "x", y__ = "y";').isEmpty());
+    });
+
+    it('should not report underscore.js', function() {
+        assert(checker.checkString('var extend = _.extend;').isEmpty());
+    });
+
+    it('should not report node globals', function() {
+        assert(checker.checkString('var a = __dirname + __filename;').isEmpty());
+    });
+});