diff --git a/extensions/amp-sidebar/0.1/amp-sidebar.js b/extensions/amp-sidebar/0.1/amp-sidebar.js
index 8019db715c88..55dc0ec8c2bd 100644
--- a/extensions/amp-sidebar/0.1/amp-sidebar.js
+++ b/extensions/amp-sidebar/0.1/amp-sidebar.js
@@ -121,10 +121,14 @@ export class AmpSidebar extends AMP.BaseElement {
       }
     });
 
+    // Replacement label for invisible close button set value in amp sidebar
+    const ariaLabel = this.element.getAttribute('data-close-button-aria-label')
+    || 'Close the sidebar';
+
     // Invisible close button at the end of sidebar for screen-readers.
     const screenReaderCloseButton = this.document_.createElement('button');
-    // TODO(aghassemi, #4146) i18n
-    screenReaderCloseButton.textContent = 'Close the sidebar';
+
+    screenReaderCloseButton.textContent = ariaLabel;
     screenReaderCloseButton.classList.add('i-amphtml-screen-reader');
     // This is for screen-readers only, should not get a tab stop.
     screenReaderCloseButton.tabIndex = -1;
diff --git a/extensions/amp-sidebar/0.1/test/test-amp-sidebar.js b/extensions/amp-sidebar/0.1/test/test-amp-sidebar.js
index 7696d1a5214a..8c03ba174ff6 100644
--- a/extensions/amp-sidebar/0.1/test/test-amp-sidebar.js
+++ b/extensions/amp-sidebar/0.1/test/test-amp-sidebar.js
@@ -61,6 +61,10 @@ describes.realWin('amp-sidebar 0.1 version', {
         if (options.open) {
           ampSidebar.setAttribute('open', '');
         }
+        if (options.closeText) {
+          ampSidebar.setAttribute('data-close-button-aria-label',
+              options.closeText);
+        };
         ampSidebar.setAttribute('id', 'sidebar1');
         ampSidebar.setAttribute('layout', 'nodisplay');
         return iframe.addElement(ampSidebar).then(() => {
@@ -68,6 +72,17 @@ describes.realWin('amp-sidebar 0.1 version', {
           return {iframe, ampSidebar};
         });
       });
+
+      it('should replace text to screen reader \
+      button in data-close-button-aria-label', () => {
+        return getAmpSidebar({'closeText':
+          'data-close-button-aria-label'}).then(obj => {
+            const sidebarElement = obj.ampSidebar;
+            const closeButton = sidebarElement.lastElementChild;
+            expect(closeButton.textContent)
+                .to.equal('data-close-button-aria-label');
+          });
+      });
     }
 
     beforeEach(() => {
@@ -122,6 +137,7 @@ describes.realWin('amp-sidebar 0.1 version', {
         expect(closeButton).to.exist;
         expect(closeButton.tagName).to.equal('BUTTON');
         assertScreenReaderElement(closeButton);
+        expect(closeButton.textContent).to.equal('Close the sidebar');
         expect(impl.close_).to.have.not.been.called;
         closeButton.click();
         expect(impl.close_).to.be.calledOnce;
diff --git a/extensions/amp-sidebar/1.0/amp-sidebar.js b/extensions/amp-sidebar/1.0/amp-sidebar.js
index ebf696a60d9b..f92995e410d5 100644
--- a/extensions/amp-sidebar/1.0/amp-sidebar.js
+++ b/extensions/amp-sidebar/1.0/amp-sidebar.js
@@ -122,10 +122,14 @@ export class AmpSidebar extends AMP.BaseElement {
       }
     });
 
+    // Replacement label for invisible close button set value in amp sidebar
+    const ariaLabel = this.element.getAttribute('data-close-button-aria-label')
+    || 'Close the sidebar';
+
     // Invisible close button at the end of sidebar for screen-readers.
     const screenReaderCloseButton = this.document_.createElement('button');
-    // TODO(aghassemi, #4146) i18n
-    screenReaderCloseButton.textContent = 'Close the sidebar';
+
+    screenReaderCloseButton.textContent = ariaLabel;
     screenReaderCloseButton.classList.add('i-amphtml-screen-reader');
     // This is for screen-readers only, should not get a tab stop.
     screenReaderCloseButton.tabIndex = -1;
diff --git a/extensions/amp-sidebar/1.0/test/test-amp-sidebar.js b/extensions/amp-sidebar/1.0/test/test-amp-sidebar.js
index 205917ac6d8d..9c4d6efa9469 100644
--- a/extensions/amp-sidebar/1.0/test/test-amp-sidebar.js
+++ b/extensions/amp-sidebar/1.0/test/test-amp-sidebar.js
@@ -62,6 +62,10 @@
          if (options.open) {
            ampSidebar.setAttribute('open', '');
          }
+         if (options.closeText) {
+           ampSidebar.setAttribute('data-close-button-aria-label',
+               options.closeText);
+         };
          ampSidebar.setAttribute('id', 'sidebar1');
          ampSidebar.setAttribute('layout', 'nodisplay');
          return iframe.addElement(ampSidebar).then(() => {
@@ -69,6 +73,17 @@
            return {iframe, ampSidebar};
          });
        });
+
+       it('should replace text to screen reader \
+       button in data-close-button-aria-label', () => {
+         return getAmpSidebar({'closeText':
+           'data-close-button-aria-label'}).then(obj => {
+             const sidebarElement = obj.ampSidebar;
+             const closeButton = sidebarElement.lastElementChild;
+             expect(closeButton.textContent)
+                 .to.equal('data-close-button-aria-label');
+           });
+       });
      }
 
      beforeEach(() => {
@@ -124,6 +139,7 @@
          expect(closeButton).to.exist;
          expect(closeButton.tagName).to.equal('BUTTON');
          assertScreenReaderElement(closeButton);
+         expect(closeButton.textContent).to.equal('Close the sidebar');
          expect(impl.close_).to.have.not.been.called;
          closeButton.click();
          expect(impl.close_).to.be.calledOnce;
diff --git a/extensions/amp-sidebar/amp-sidebar.md b/extensions/amp-sidebar/amp-sidebar.md
index 38989658c6c1..b05b8104fa47 100644
--- a/extensions/amp-sidebar/amp-sidebar.md
+++ b/extensions/amp-sidebar/amp-sidebar.md
@@ -70,7 +70,7 @@ Example:
 
 ### Opening and closing the sidebar
 
-To toggle, open, or close the sidebar when an element is tapped or clicked, set the [`on`](../../spec/amp-actions-and-events.md) action attribute on the element, and specify one of the following action methods: 
+To toggle, open, or close the sidebar when an element is tapped or clicked, set the [`on`](../../spec/amp-actions-and-events.md) action attribute on the element, and specify one of the following action methods:
 
 <table>
   <tr>
@@ -122,6 +122,10 @@ Specifies the display layout of the sidebar, which must be `nodisplay`.
 
 This attribute is present when the sidebar is open.
 
+##### data-close-button-aria-label**
+
+Optional attribute used to set ARIA label for the close button added for accessibility.
+
 ##### common attributes
 
 This element includes [common attributes](https://www.ampproject.org/docs/reference/common_attributes) extended to AMP components.