diff --git a/packages/polaris-viz/CHANGELOG.md b/packages/polaris-viz/CHANGELOG.md
index 7b09dbfd8..9e5a88397 100644
--- a/packages/polaris-viz/CHANGELOG.md
+++ b/packages/polaris-viz/CHANGELOG.md
@@ -9,6 +9,10 @@ and adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [15.3.4] - 2024-12-03
 
+### Added
+
+- Added dashed `lineStyle` support for custom legends in `<LineChartRelational />`
+
 ### Fixed
 
 - Fixed issue where `<DonutChart />` would run the `seriesNameFormatter` for multiple times on a `<Legend />`.
diff --git a/packages/polaris-viz/src/components/LinePreview/tests/LinePreview.test.tsx b/packages/polaris-viz/src/components/LinePreview/tests/LinePreview.test.tsx
index b16da34a7..c286e80b3 100644
--- a/packages/polaris-viz/src/components/LinePreview/tests/LinePreview.test.tsx
+++ b/packages/polaris-viz/src/components/LinePreview/tests/LinePreview.test.tsx
@@ -20,4 +20,12 @@ describe('<LinePreview />', () => {
 
     expect(linePreview).toContainReactComponentTimes('circle', 3);
   });
+
+  it('renders a dashed path if lineStyle is dashed', () => {
+    const linePreview = mount(<LinePreview color="red" lineStyle="dashed" />);
+
+    expect(linePreview).toContainReactComponent('path', {
+      strokeDasharray: '1.5 3',
+    });
+  });
 });
diff --git a/packages/polaris-viz/src/components/shared/SeriesIcon/SeriesIcon.test.tsx b/packages/polaris-viz/src/components/shared/SeriesIcon/SeriesIcon.test.tsx
index f71b0788e..d0aa15884 100644
--- a/packages/polaris-viz/src/components/shared/SeriesIcon/SeriesIcon.test.tsx
+++ b/packages/polaris-viz/src/components/shared/SeriesIcon/SeriesIcon.test.tsx
@@ -52,4 +52,12 @@ describe('isComparison', () => {
       lineStyle: 'dotted',
     });
   });
+
+  it('renders LinePreview as dashed when lineStyle prop is set to dashed', () => {
+    const component = mount(
+      <SeriesIcon shape="Line" color="red" lineStyle="dashed" />,
+    );
+
+    expect(component.find(LinePreview)).toHaveReactProps({lineStyle: 'dashed'});
+  });
 });