diff --git a/src/installer/managed/Microsoft.NET.HostModel/Bundle/TargetInfo.cs b/src/installer/managed/Microsoft.NET.HostModel/Bundle/TargetInfo.cs
index 87c644272379e9..b87911ef8dd582 100644
--- a/src/installer/managed/Microsoft.NET.HostModel/Bundle/TargetInfo.cs
+++ b/src/installer/managed/Microsoft.NET.HostModel/Bundle/TargetInfo.cs
@@ -62,6 +62,12 @@ public TargetInfo(OSPlatform? os, Architecture? arch, Version targetFrameworkVer
                 // This is only necessary for R2R assemblies, but we do it for all assemblies for simplicity.
                 AssemblyAlignment = 4096;
             }
+            else if (Arch == Architecture.LoongArch64)
+            {
+                // We align assemblies in the bundle at 16K so that we can use mmap on Unix without changing the page alignment of LOONGARCH64 R2R code.
+                // This is only necessary for R2R assemblies, but we do it for all assemblies for simplicity.
+                AssemblyAlignment = 16384;
+            }
             else if (Arch == Architecture.Arm64)
             {
                 // We align assemblies in the bundle at 4K so that we can use mmap on Unix without changing the page alignment of ARM64 R2R code.
@@ -95,10 +101,11 @@ public override string ToString()
             return $"OS: {os} Arch: {arch} FrameworkVersion: {FrameworkVersion}";
         }
 
-        private static readonly OSPlatform s_freebsdOSPlatform = OSPlatform.Create("FREEBSD");
-
-        private static OSPlatform HostOS => RuntimeInformation.IsOSPlatform(OSPlatform.Linux) ? OSPlatform.Linux :
-                                    RuntimeInformation.IsOSPlatform(OSPlatform.OSX) ? OSPlatform.OSX : RuntimeInformation.IsOSPlatform(s_freebsdOSPlatform) ? s_freebsdOSPlatform : OSPlatform.Windows;
+        private static OSPlatform? _hostOS;
+        private static OSPlatform HostOS => _hostOS ??= RuntimeInformation.IsOSPlatform(OSPlatform.Linux) ? OSPlatform.Linux :
+            RuntimeInformation.IsOSPlatform(OSPlatform.OSX) ? OSPlatform.OSX :
+            RuntimeInformation.IsOSPlatform(OSPlatform.FreeBSD) ? OSPlatform.FreeBSD :
+            RuntimeInformation.IsOSPlatform(OSPlatform.Illumos) ? OSPlatform.Illumos : OSPlatform.Windows;
 
         public bool IsOSX => OS.Equals(OSPlatform.OSX);
         public bool IsWindows => OS.Equals(OSPlatform.Windows);
@@ -119,4 +126,22 @@ public bool ShouldExclude(string relativePath) =>
         private string HostFxr => IsWindows ? "hostfxr.dll" : IsOSX ? "libhostfxr.dylib" : "libhostfxr.so";
         private string HostPolicy => IsWindows ? "hostpolicy.dll" : IsOSX ? "libhostpolicy.dylib" : "libhostpolicy.so";
     }
+
+    file static class PlatformExtensions
+    {
+        extension(OSPlatform)
+        {
+#if NETFRAMEWORK
+            public static OSPlatform FreeBSD => OSPlatform.Create("FREEBSD");
+#endif
+            public static OSPlatform Illumos => OSPlatform.Create("ILLUMOS");
+        }
+
+#if NETFRAMEWORK
+        extension(Architecture)
+        {
+            public static Architecture LoongArch64 => (Architecture)6;
+        }
+#endif
+    }
 }
diff --git a/src/installer/tests/Assets/Projects/HelloWorld/SelfContained.csproj b/src/installer/tests/Assets/Projects/HelloWorld/SelfContained.csproj
index d4197da0304bef..18c2731efa7413 100644
--- a/src/installer/tests/Assets/Projects/HelloWorld/SelfContained.csproj
+++ b/src/installer/tests/Assets/Projects/HelloWorld/SelfContained.csproj
@@ -9,7 +9,7 @@
 
     <!-- Set the RID when building on a platform where we support self-contained + apphost -->
     <_SupportedPlatform Condition="'$(TargetsLinux)' == 'true' or '$(TargetsOSX)' == 'true' or '$(TargetsWindows)' == 'true'">true</_SupportedPlatform>
-    <_SupportedArchitecture Condition="'$(TargetArchitecture)' == 'x64' or '$(TargetArchitecture)' == 'x86' or '$(TargetArchitecture)' == 'arm' or'$(TargetArchitecture)' == 'arm64'">true</_SupportedArchitecture>
+    <_SupportedArchitecture Condition="'$(TargetArchitecture)' == 'x64' or '$(TargetArchitecture)' == 'x86' or '$(TargetArchitecture)' == 'arm' or '$(TargetArchitecture)' == 'arm64' or '$(TargetArchitecture)' == 'loongarch64'">true</_SupportedArchitecture>
     <RuntimeIdentifier Condition="'$(_SupportedPlatform)' == 'true' and '$(_SupportedArchitecture)' == 'true'">$(OutputRID)</RuntimeIdentifier>
   </PropertyGroup>
 </Project>
diff --git a/src/installer/tests/Microsoft.NET.HostModel.Tests/Bundle/BundlerConsistencyTests.cs b/src/installer/tests/Microsoft.NET.HostModel.Tests/Bundle/BundlerConsistencyTests.cs
index b3ac86a8312a80..cb9d3ca634d62d 100644
--- a/src/installer/tests/Microsoft.NET.HostModel.Tests/Bundle/BundlerConsistencyTests.cs
+++ b/src/installer/tests/Microsoft.NET.HostModel.Tests/Bundle/BundlerConsistencyTests.cs
@@ -309,7 +309,7 @@ public void AssemblyAlignment()
             Bundler bundler = CreateBundlerInstance();
             bundler.GenerateBundle(fileSpecs);
 
-            var alignment = OperatingSystem.IsLinux() && RuntimeInformation.OSArchitecture == Architecture.Arm64 ? 4096 : 16;
+            var alignment = OperatingSystem.IsLinux() && RuntimeInformation.OSArchitecture == Architecture.Arm64 ? 4096 : (OperatingSystem.IsLinux() && RuntimeInformation.OSArchitecture == Architecture.LoongArch64 ? 16384 : 16);
             bundler.BundleManifest.Files.ForEach(file =>
                 Assert.True((file.Type != FileType.Assembly) || (file.Offset % alignment == 0)));
         }