diff --git a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/WebRequestPSCmdlet.Common.cs b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/WebRequestPSCmdlet.Common.cs
index fcabe09c18..8f1c6a4caf 100644
--- a/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/WebRequestPSCmdlet.Common.cs
+++ b/src/Microsoft.PowerShell.Commands.Utility/commands/utility/WebCmdlet/Common/WebRequestPSCmdlet.Common.cs
@@ -1616,7 +1616,8 @@ namespace Microsoft.PowerShell.Commands
         {
             if (_relationLink == null)
             {
-                _relationLink = new Dictionary<string, string>();
+                // Must ignore the case of relation links. See RFC 8288 (https://tools.ietf.org/html/rfc8288)
+                _relationLink = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
             }
             else
             {
diff --git a/test/powershell/Modules/Microsoft.PowerShell.Utility/WebCmdlets.Tests.ps1 b/test/powershell/Modules/Microsoft.PowerShell.Utility/WebCmdlets.Tests.ps1
index 27087ccb9e..22e3733484 100644
--- a/test/powershell/Modules/Microsoft.PowerShell.Utility/WebCmdlets.Tests.ps1
+++ b/test/powershell/Modules/Microsoft.PowerShell.Utility/WebCmdlets.Tests.ps1
@@ -733,6 +733,28 @@ Describe "Invoke-WebRequest tests" -Tags "Feature" {
         $result.Output.RelationLink["self"] | Should -BeExactly "${baseUri}?maxlinks=5&linknumber=2&type=multiple"
     }
 
+
+    It "Validate Invoke-WebRequest RelationLink keys are treated case-insensitively" {
+        $uri = Get-WebListenerUrl -Test 'Link' -Query @{maxlinks = 5; linknumber = 2; type = 'multiple'}
+        $command = "Invoke-WebRequest -Uri '$uri'"
+        $result = ExecuteWebCommand -command $command
+
+        $result.Output.RelationLink["next"] | Should -Not -BeNullOrEmpty
+        $result.Output.RelationLink["next"] | Should -BeExactly $result.Output.RelationLink["Next"]
+
+        $result.Output.RelationLink["last"] | Should -Not -BeNullOrEmpty
+        $result.Output.RelationLink["last"] | Should -BeExactly $result.Output.RelationLink["LAST"]
+
+        $result.Output.RelationLink["prev"] | Should -Not -BeNullOrEmpty
+        $result.Output.RelationLink["prev"] | Should -BeExactly $result.Output.RelationLink["preV"]
+
+        $result.Output.RelationLink["first"] | Should -Not -BeNullOrEmpty
+        $result.Output.RelationLink["first"] | Should -BeExactly $result.Output.RelationLink["FiRsT"]
+
+        $result.Output.RelationLink["self"] | Should -Not -BeNullOrEmpty
+        $result.Output.RelationLink["self"] | Should -BeExactly $result.Output.RelationLink["self"]
+    }
+
     It "Validate Invoke-WebRequest quietly ignores invalid Link Headers in RelationLink property: <type>" -TestCases @(
         @{ type = "noUrl" }
         @{ type = "malformed" }