diff --git a/.gitmodules b/.gitmodules
index f7b3b45447..995a75cd7a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -25,3 +25,6 @@
 [submodule "spectre-console"]
 	path = src/externalPackages/src/spectre-console
 	url = https://github.com/spectreconsole/spectre.console
+[submodule "src/externalPackages/src/antlr4"]
+	path = src/externalPackages/src/antlr4
+	url = https://github.com/antlr/antlr4
diff --git a/eng/Versions.props b/eng/Versions.props
index ee32f3b0b4..d261d3d3d9 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -14,6 +14,7 @@
 
   <!-- External package versions -->
   <PropertyGroup>
+    <Antlr4Version>4.13.1</Antlr4Version>
     <AzureActiveDirectoryIdentityModelExtensionsForDotNetReleaseVersion>8.0.1</AzureActiveDirectoryIdentityModelExtensionsForDotNetReleaseVersion>
     <CssParserReleaseVersionSuffix>20230414.1</CssParserReleaseVersionSuffix>
     <HumanizerReleaseVersion>2.14.1</HumanizerReleaseVersion>
diff --git a/src/externalPackages/projects/antlr4.proj b/src/externalPackages/projects/antlr4.proj
new file mode 100644
index 0000000000..9497f2c675
--- /dev/null
+++ b/src/externalPackages/projects/antlr4.proj
@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.Build.NoTargets">
+
+  <PropertyGroup>
+    <!-- Project Paths -->
+    <Antlr4Directory>$(ProjectDirectory)runtime/CSharp/src/</Antlr4Directory>
+    <Antlr4ProjectPath>$(Antlr4Directory)Antlr4.csproj</Antlr4ProjectPath>
+    <PackagesOutput>$(Antlr4Directory)bin/$(Configuration)/</PackagesOutput>
+
+    <DotNetToolArgs>$(DotNetToolArgs) /p:Configuration=$(Configuration)</DotNetToolArgs>
+
+    <BuildCommand>$(DotNetTool) build -c $(Configuration) -f netstandard2.0 /p:TargetFrameworks=netstandard2.0 $(Antlr4ProjectPath) /bl:$(ArtifactsLogRepoDir)build.binlog</BuildCommand>
+  </PropertyGroup>
+</Project>
diff --git a/src/externalPackages/src/antlr4 b/src/externalPackages/src/antlr4
new file mode 160000
index 0000000000..7ed420ff2c
--- /dev/null
+++ b/src/externalPackages/src/antlr4
@@ -0,0 +1 @@
+Subproject commit 7ed420ff2c78d62883875c442d75f32e73bc86c8