diff --git a/UNRELEASED-v8.md b/UNRELEASED-v8.md
index 53a4bfe34be..7f112ab3624 100644
--- a/UNRELEASED-v8.md
+++ b/UNRELEASED-v8.md
@@ -21,6 +21,7 @@ Use [the changelog guidelines](/documentation/Versioning%20and%20changelog.md) t
 - Removed the `duration()` scss function and replaced any instances with tokens ([#4699](https://github.com/Shopify/polaris-react/pull/4699))
 - Removed the `$duration-data` global variable ([#4699](https://github.com/Shopify/polaris-react/pull/4699))
 - Removed the `spacing()` scss function and replaced any instances with tokens ([#4691](https://github.com/Shopify/polaris-react/pull/4691/))
+- Removed the `px()` scss function ([#4751](https://github.com/Shopify/polaris-react/pull/4751))
 
 ### New components
 
diff --git a/src/styles/foundation/_utilities.scss b/src/styles/foundation/_utilities.scss
index 85c28bda793..9e44531e3c4 100644
--- a/src/styles/foundation/_utilities.scss
+++ b/src/styles/foundation/_utilities.scss
@@ -21,26 +21,6 @@ $base-font-size: 10px;
   }
 }
 
-/// Returns the value in pixels for a given rem value.
-/// @param {Number} $value - The rem value to be converted.
-/// @return {Number} The converted value in pixels.
-
-@function px($value) {
-  $unit: unit($value);
-
-  @if $value == 0 {
-    @return 0;
-  } @else if $unit == 'px' {
-    @return $value;
-  } @else if $unit == 'em' {
-    @return ($value / 1em) * $base-font-size;
-  } @else if $unit == 'rem' {
-    @return ($value / 1rem) * $base-font-size;
-  } @else {
-    @error 'Value must be in rem, em, or px.';
-  }
-}
-
 /// Returns the value in ems for a given pixel value. Note that this
 /// only works for elements that have had no font-size changes.
 /// @param {Number} $value - The pixel value to be converted.