diff --git a/UNRELEASED-v8.md b/UNRELEASED-v9.md
similarity index 98%
rename from UNRELEASED-v8.md
rename to UNRELEASED-v9.md
index cd8eb01713a..f320f469294 100644
--- a/UNRELEASED-v8.md
+++ b/UNRELEASED-v9.md
@@ -35,6 +35,7 @@ Use [the changelog guidelines](/documentation/Versioning%20and%20changelog.md) t
 - Removed the border-radius() function and replaced any instances with tokens ([#4793](https://github.com/Shopify/polaris-react/pull/4793))
 - Removed the shadow() function (replaced any instances with tokens) and renamed shadow legacy tokens ([#4823](https://github.com/Shopify/polaris-react/pull/4823))
 - Removed the ms-high-contrast-color() function and replaced any instances with values ([#4938](https://github.com/Shopify/polaris-react/pull/4938))
+- Removed the `border()` scss function ([#4934](https://github.com/Shopify/polaris-react/pull/4934))
 - Removed the font-family() function and replaced any instances with tokens ([#4940](https://github.com/Shopify/polaris-react/pull/4940))
 
 ### New components
diff --git a/src/components/ActionList/ActionList.scss b/src/components/ActionList/ActionList.scss
index 99b08dd50cd..5c5c73205e7 100644
--- a/src/components/ActionList/ActionList.scss
+++ b/src/components/ActionList/ActionList.scss
@@ -13,14 +13,14 @@
 }
 
 .Section-withoutTitle:not(:first-child) {
-  border-top: border('divider');
+  border-top: var(--p-border-divider);
 }
 
 .Actions {
   outline: none;
   list-style: none;
   margin: 0;
-  border-top: border('divider');
+  border-top: var(--p-border-divider);
   padding: var(--p-space-2);
 }
 
diff --git a/src/components/Card/Card.scss b/src/components/Card/Card.scss
index 972e57b1792..89d0c44cb48 100644
--- a/src/components/Card/Card.scss
+++ b/src/components/Card/Card.scss
@@ -53,7 +53,7 @@
   }
 
   + .Section {
-    border-top: border('divider');
+    border-top: var(--p-border-divider);
 
     @media print {
       border-top: 0;
@@ -100,7 +100,7 @@
   }
 
   .Header + & {
-    border-top: border('divider');
+    border-top: var(--p-border-divider);
     margin-top: var(--p-space-5);
   }
 }
@@ -123,7 +123,7 @@
   + .Subsection {
     margin-top: var(--p-space-4);
     padding-top: var(--p-space-4);
-    border-top: border('divider');
+    border-top: var(--p-border-divider);
 
     @media print {
       border-top: 0;
@@ -150,7 +150,7 @@
   }
 
   .Section-subdued + & {
-    border-top: border('divider');
+    border-top: var(--p-border-divider);
     padding: var(--p-space-5);
   }
 }
diff --git a/src/components/DataTable/DataTable.scss b/src/components/DataTable/DataTable.scss
index 75383b9c72a..840a4e8f5df 100644
--- a/src/components/DataTable/DataTable.scss
+++ b/src/components/DataTable/DataTable.scss
@@ -62,7 +62,7 @@ $breakpoint: 768px;
 // stylelint-disable selector-max-class, selector-max-combinators
 .TableRow + .TableRow {
   .Cell {
-    border-top: border('divider');
+    border-top: var(--p-border-divider);
   }
 }
 
@@ -92,7 +92,7 @@ $breakpoint: 768px;
 
 .Cell-header {
   @include text-emphasis-normal;
-  border-bottom: border(dark);
+  border-bottom: var(--p-border-dark);
   border-top: 0;
 }
 
@@ -166,11 +166,11 @@ $breakpoint: 768px;
 .Cell-total {
   @include text-emphasis-strong;
   background: var(--p-surface-subdued);
-  border-bottom: border();
+  border-bottom: var(--p-border-base);
 }
 
 .Cell-total-footer {
-  border-top: border('divider');
+  border-top: var(--p-border-divider);
   border-bottom: none;
   border-bottom-left-radius: var(--p-border-radius-1);
   border-bottom-right-radius: var(--p-border-radius-1);
@@ -181,7 +181,7 @@ $breakpoint: 768px;
   background: var(--p-surface-subdued);
   color: var(--p-text-subdued);
   text-align: center;
-  border-top: border('divider');
+  border-top: var(--p-border-divider);
   border-bottom-left-radius: var(--p-border-radius-1);
   border-bottom-right-radius: var(--p-border-radius-1);
 }
diff --git a/src/components/DescriptionList/DescriptionList.scss b/src/components/DescriptionList/DescriptionList.scss
index fb1e9e7c232..73f7dc96631 100644
--- a/src/components/DescriptionList/DescriptionList.scss
+++ b/src/components/DescriptionList/DescriptionList.scss
@@ -32,7 +32,7 @@ $breakpoint: 550px;
 
     // stylelint-disable-next-line selector-max-class, selector-max-combinators
     .Description + & + .Description {
-      border-top: border('divider');
+      border-top: var(--p-border-divider);
     }
   }
 }
@@ -46,7 +46,7 @@ $breakpoint: 550px;
   }
 
   + .Term {
-    border-top: border('divider');
+    border-top: var(--p-border-divider);
   }
 
   @include page-content-breakpoint-after($breakpoint) {
@@ -59,7 +59,7 @@ $breakpoint: 550px;
 
     // stylelint-disable-next-line selector-max-class, selector-max-combinators
     + .Term + .Description {
-      border-top: border('divider');
+      border-top: var(--p-border-divider);
     }
   }
 }
diff --git a/src/components/Filters/Filters.scss b/src/components/Filters/Filters.scss
index 57c76783471..cfef67a89bd 100644
--- a/src/components/Filters/Filters.scss
+++ b/src/components/Filters/Filters.scss
@@ -19,7 +19,7 @@ $list-filters-footer-height: 70px;
   top: 0;
   width: 100%;
   padding: var(--p-space-4) var(--p-space-5);
-  border-bottom: border('divider');
+  border-bottom: var(--p-border-divider);
   height: $list-filters-header-height;
   box-sizing: border-box;
   display: flex;
@@ -46,7 +46,7 @@ $list-filters-footer-height: 70px;
   bottom: 0;
   width: 100%;
   padding: var(--p-space-4) var(--p-space-5);
-  border-top: border('divider');
+  border-top: var(--p-border-divider);
   height: $list-filters-footer-height;
   box-sizing: border-box;
   display: flex;
@@ -65,7 +65,7 @@ $list-filters-footer-height: 70px;
 }
 
 .EmptyFooterState {
-  border-top: border('divider');
+  border-top: var(--p-border-divider);
   padding-top: var(--p-space-4);
   width: 100%;
   display: flex;
diff --git a/src/components/IndexTable/IndexTable.scss b/src/components/IndexTable/IndexTable.scss
index b40dbd8666b..8f1d82ae4b8 100644
--- a/src/components/IndexTable/IndexTable.scss
+++ b/src/components/IndexTable/IndexTable.scss
@@ -422,7 +422,7 @@ $scroll-bar-size: var(--p-space-2);
   z-index: var(--pc-index-table-scroll-bar);
   bottom: 0;
   padding: var(--p-space-05);
-  border-top: border('divider');
+  border-top: var(--p-border-divider);
   background-color: var(--p-surface);
   border-bottom-right-radius: var(--p-border-radius-1);
   border-bottom-left-radius: var(--p-border-radius-1);
@@ -480,7 +480,7 @@ $scroll-bar-size: var(--p-space-2);
   transform: translateX(calc(-1 * var(--pc-index-table-translate-offset)));
   transition: transform var(--p-ease) var(--p-duration-200);
   display: flex;
-  border-top: border('divider');
+  border-top: var(--p-border-divider);
   filter: none;
   align-items: center;
 }
diff --git a/src/components/Layout/Layout.scss b/src/components/Layout/Layout.scss
index 520bdd15ce5..5775cd215fc 100644
--- a/src/components/Layout/Layout.scss
+++ b/src/components/Layout/Layout.scss
@@ -69,7 +69,7 @@ $relative-size: $primary-basis / $secondary-basis;
   + .AnnotatedSection {
     @include page-content-when-not-fully-condensed {
       padding-top: var(--p-space-4);
-      border-top: border('divider');
+      border-top: var(--p-border-divider);
     }
   }
 }
diff --git a/src/components/Listbox/components/Option/Option.scss b/src/components/Listbox/components/Option/Option.scss
index 4a033a3785a..50b36eca1f6 100644
--- a/src/components/Listbox/components/Option/Option.scss
+++ b/src/components/Listbox/components/Option/Option.scss
@@ -11,5 +11,5 @@
 }
 
 .divider {
-  border-bottom: border('divider');
+  border-bottom: var(--p-border-divider);
 }
diff --git a/src/components/Listbox/components/Section/Section.scss b/src/components/Listbox/components/Section/Section.scss
index cb78debb671..2fc27034a02 100644
--- a/src/components/Listbox/components/Section/Section.scss
+++ b/src/components/Listbox/components/Section/Section.scss
@@ -4,7 +4,7 @@
   list-style-type: none;
   padding: 0;
   margin: 0;
-  border-bottom: border('divider');
+  border-bottom: var(--p-border-divider);
 }
 
 .noDivider {
diff --git a/src/components/Modal/components/Footer/Footer.scss b/src/components/Modal/components/Footer/Footer.scss
index 8e4a4f0f38a..c4f4c9a01ef 100644
--- a/src/components/Modal/components/Footer/Footer.scss
+++ b/src/components/Modal/components/Footer/Footer.scss
@@ -7,7 +7,7 @@
   width: 100%;
   min-height: calc(var(--p-space-4) * 4);
   padding: var(--p-space-4);
-  border-top: border('divider');
+  border-top: var(--p-border-divider);
 }
 
 .FooterContent {
diff --git a/src/components/Modal/components/Header/Header.scss b/src/components/Modal/components/Header/Header.scss
index 57cf8ec101c..42dee2637d1 100644
--- a/src/components/Modal/components/Header/Header.scss
+++ b/src/components/Modal/components/Header/Header.scss
@@ -5,7 +5,7 @@
   align-items: flex-start;
   flex-shrink: 0;
   padding: var(--p-space-4) var(--p-space-5);
-  border-bottom: border('divider');
+  border-bottom: var(--p-border-divider);
 }
 
 .titleHidden {
diff --git a/src/components/Modal/components/Section/Section.scss b/src/components/Modal/components/Section/Section.scss
index bdd1460b0a9..68e8726848c 100644
--- a/src/components/Modal/components/Section/Section.scss
+++ b/src/components/Modal/components/Section/Section.scss
@@ -5,7 +5,7 @@
   padding: var(--p-space-5);
 
   &:not(:last-of-type) {
-    border-bottom: border('divider');
+    border-bottom: var(--p-border-divider);
   }
 
   &.subdued {
diff --git a/src/components/Navigation/Navigation.scss b/src/components/Navigation/Navigation.scss
index aaa1a752c77..81f24bb3b61 100644
--- a/src/components/Navigation/Navigation.scss
+++ b/src/components/Navigation/Navigation.scss
@@ -17,7 +17,7 @@ $nav-max-width: 360px;
   min-height: 100%;
   background-color: var(--p-background);
   -webkit-overflow-scrolling: touch;
-  border-right: border('divider');
+  border-right: var(--p-border-divider);
 
   @include safe-area-for(padding-bottom, 0, bottom);
 
@@ -343,7 +343,7 @@ $secondary-item-font-size: 15px;
 }
 
 .Section-withSeparator {
-  border-top: border('divider');
+  border-top: var(--p-border-divider);
 }
 
 .SectionHeading {
diff --git a/src/components/Page/Page.scss b/src/components/Page/Page.scss
index dc9248206db..66a2d295b5e 100644
--- a/src/components/Page/Page.scss
+++ b/src/components/Page/Page.scss
@@ -37,6 +37,6 @@ body {
 }
 
 .divider {
-  border-top: border();
+  border-top: var(--p-border-base);
   padding-top: var(--p-space-4);
 }
diff --git a/src/components/PageActions/PageActions.scss b/src/components/PageActions/PageActions.scss
index 508c98fac64..e707c791617 100644
--- a/src/components/PageActions/PageActions.scss
+++ b/src/components/PageActions/PageActions.scss
@@ -3,7 +3,7 @@
 .PageActions {
   margin: 0 auto;
   padding: var(--p-space-5);
-  border-top: border('divider');
+  border-top: var(--p-border-divider);
 
   @include page-content-when-not-fully-condensed {
     padding: var(--p-space-5) 0;
diff --git a/src/components/Popover/Popover.scss b/src/components/Popover/Popover.scss
index 72caa0f0d4b..0a642bd88ec 100644
--- a/src/components/Popover/Popover.scss
+++ b/src/components/Popover/Popover.scss
@@ -93,7 +93,7 @@ $vertical-motion-offset: -5px;
   max-width: 100%;
 
   + .Pane {
-    border-top: border('divider');
+    border-top: var(--p-border-divider);
   }
 
   &:focus {
@@ -110,7 +110,7 @@ $vertical-motion-offset: -5px;
   padding: var(--p-space-4);
 
   + .Section {
-    border-top: border('divider');
+    border-top: var(--p-border-divider);
   }
 }
 
diff --git a/src/components/ResourceItem/ResourceItem.scss b/src/components/ResourceItem/ResourceItem.scss
index 9b90edadf23..c158c9684a6 100644
--- a/src/components/ResourceItem/ResourceItem.scss
+++ b/src/components/ResourceItem/ResourceItem.scss
@@ -259,7 +259,7 @@ $resource-list-item-variables: (
   @include focus-ring($border-width: -1px);
 
   .ListItem + & {
-    border-top: border('divider');
+    border-top: var(--p-border-divider);
   }
 
   &::after {
diff --git a/src/components/ResourceList/ResourceList.scss b/src/components/ResourceList/ResourceList.scss
index 68ba2e8a3e2..8864a451f32 100644
--- a/src/components/ResourceList/ResourceList.scss
+++ b/src/components/ResourceList/ResourceList.scss
@@ -24,7 +24,7 @@ $item-wrapper-loading-height: 64px;
   }
 
   + .ResourceList {
-    border-top: border('divider');
+    border-top: var(--p-border-divider);
   }
 }
 
@@ -37,7 +37,7 @@ $item-wrapper-loading-height: 64px;
   border-top-right-radius: var(--p-border-radius-2);
 
   + .ResourceList {
-    border-top: border('divider');
+    border-top: var(--p-border-divider);
   }
 }
 
@@ -212,7 +212,7 @@ $item-wrapper-loading-height: 64px;
   max-width: 100%;
 
   + .ItemWrapper {
-    border-top: border('divider');
+    border-top: var(--p-border-divider);
   }
 }
 
diff --git a/src/components/Sheet/Sheet.scss b/src/components/Sheet/Sheet.scss
index 5c0c51cc99a..baef5752387 100644
--- a/src/components/Sheet/Sheet.scss
+++ b/src/components/Sheet/Sheet.scss
@@ -11,7 +11,7 @@ $sheet-desktop-width: 380px;
   box-shadow: var(--p-shadow-modal);
 
   @media screen and (-ms-high-contrast: active) {
-    border-left: border();
+    border-left: var(--p-border-base);
   }
 
   @include frame-when-nav-displayed {
diff --git a/src/components/Tabs/Tabs.scss b/src/components/Tabs/Tabs.scss
index 0f6d51c58ad..70f81d76cc7 100644
--- a/src/components/Tabs/Tabs.scss
+++ b/src/components/Tabs/Tabs.scss
@@ -15,7 +15,7 @@ $focus-state-box-shadow-color: rgba(0, 0, 0, 0.8);
 }
 
 .Wrapper {
-  border-bottom: border('divider');
+  border-bottom: var(--p-border-divider);
   padding: 0 var(--p-space-2);
 }
 
diff --git a/src/components/TextField/TextField.scss b/src/components/TextField/TextField.scss
index 9346ab7fad7..7191913ad44 100644
--- a/src/components/TextField/TextField.scss
+++ b/src/components/TextField/TextField.scss
@@ -96,7 +96,7 @@ $prefix-horizontal-spacing: var(--p-space-2);
   margin: 0;
   padding: control-vertical-padding() $backdrop-horizontal-spacing;
   background: none;
-  border: border(transparent);
+  border: var(--p-border-transparent);
   font-family: var(--p-font-family-sans);
   appearance: none;
   caret-color: var(--p-text);
diff --git a/src/components/Thumbnail/Thumbnail.scss b/src/components/Thumbnail/Thumbnail.scss
index bb36d2be89d..44277404e76 100644
--- a/src/components/Thumbnail/Thumbnail.scss
+++ b/src/components/Thumbnail/Thumbnail.scss
@@ -8,7 +8,7 @@
   min-width: thumbnail-size(small);
   max-width: 100%;
   border-radius: var(--p-border-radius-1);
-  border: border('divider');
+  border: var(--p-border-divider);
 
   &::after {
     content: '';
diff --git a/src/components/TopBar/components/Menu/Menu.scss b/src/components/TopBar/components/Menu/Menu.scss
index 05ba989ac10..d72457ce646 100644
--- a/src/components/TopBar/components/Menu/Menu.scss
+++ b/src/components/TopBar/components/Menu/Menu.scss
@@ -77,5 +77,5 @@ $activator-variables: (
 .Section {
   margin-top: var(--p-space-2);
   padding-top: var(--p-space-2);
-  border-top: border('divider');
+  border-top: var(--p-border-divider);
 }
diff --git a/src/components/TopBar/components/Menu/components/Message/Message.scss b/src/components/TopBar/components/Menu/components/Message/Message.scss
index 1d16f95a0fc..3aaa404a49e 100644
--- a/src/components/TopBar/components/Menu/components/Message/Message.scss
+++ b/src/components/TopBar/components/Menu/components/Message/Message.scss
@@ -6,5 +6,5 @@ $section-max-width: 325px;
   max-width: $section-max-width;
   margin-top: var(--p-space-2);
   padding-top: var(--p-space-2);
-  border-top: border('divider');
+  border-top: var(--p-border-divider);
 }
diff --git a/src/styles/_common.scss b/src/styles/_common.scss
index d7d99ada3bd..466bf516a01 100644
--- a/src/styles/_common.scss
+++ b/src/styles/_common.scss
@@ -5,7 +5,6 @@
 // stylelint-disable scss/partial-no-import
 
 @import './foundation/utilities';
-@import './foundation/borders';
 @import './foundation/layout';
 @import './foundation/focus-ring';
 @import './foundation/accessibility';
diff --git a/src/styles/_public-api.scss b/src/styles/_public-api.scss
index 4ca6e299bdd..0b9e9fe93dd 100644
--- a/src/styles/_public-api.scss
+++ b/src/styles/_public-api.scss
@@ -17,7 +17,6 @@
 // stylelint-disable scss/partial-no-import
 
 @import './foundation/utilities';
-@import './foundation/borders';
 @import './foundation/layout';
 @import './foundation/focus-ring';
 
diff --git a/src/styles/foundation/_borders.scss b/src/styles/foundation/_borders.scss
deleted file mode 100644
index af56f095a52..00000000000
--- a/src/styles/foundation/_borders.scss
+++ /dev/null
@@ -1,20 +0,0 @@
-$borders-data: (
-  base: var(--p-border-width-1) solid var(--p-border-subdued),
-  dark: var(--p-border-width-1) solid var(--p-border),
-  transparent: var(--p-border-width-1) solid transparent,
-  divider: var(--p-border-width-1) solid var(--p-divider),
-);
-
-/// Returns the default border.
-/// @param {String} $variant [base] - The border variant key.
-/// @return {List} The border value.
-
-@function border($variant: base) {
-  $fetched-value: map-get($borders-data, $variant);
-
-  @if $fetched-value {
-    @return $fetched-value;
-  } @else {
-    @error 'Border variant `#{$variant}` not found. Available variants: #{available-names($borders-data)}';
-  }
-}
diff --git a/src/tokens/token-groups/shape.json b/src/tokens/token-groups/shape.json
index 2bcd0194e71..27508fcebb6 100644
--- a/src/tokens/token-groups/shape.json
+++ b/src/tokens/token-groups/shape.json
@@ -11,5 +11,9 @@
   "border-radius-half": "50%",
   "border-width-1": "1px",
   "border-width-2": "2px",
-  "border-width-3": "3px"
+  "border-width-3": "3px",
+  "border-base": "var(--p-border-width-1) solid var(--p-border-subdued)",
+  "border-dark": "var(--p-border-width-1) solid var(--p-border)",
+  "border-transparent": "var(--p-border-width-1) solid transparent",
+  "border-divider": "var(--p-border-width-1) solid var(--p-divider)"
 }