diff --git a/scripts/build-unity-package.ps1 b/scripts/build-unity-package.ps1
new file mode 100644
index 00000000..e5cc82aa
--- /dev/null
+++ b/scripts/build-unity-package.ps1
@@ -0,0 +1,84 @@
+param(
+  [string] $Configuration = "Release",
+  [string] $OutputDirectory = "artifacts\unity\org.gamecult.cultlib"
+)
+
+$ErrorActionPreference = "Stop"
+
+$repoRoot = Split-Path -Parent $PSScriptRoot
+$projectPath = Join-Path $repoRoot "src\GameCult.Mesh\GameCult.Mesh.csproj"
+$templateRoot = Join-Path $repoRoot "unity\org.gamecult.cultlib"
+$publishRoot = Join-Path $repoRoot "artifacts\unity-publish"
+$outputRoot = if ([System.IO.Path]::IsPathRooted($OutputDirectory)) {
+  $OutputDirectory
+} else {
+  Join-Path $repoRoot $OutputDirectory
+}
+$pluginRoot = Join-Path $outputRoot "Runtime\Plugins"
+
+if (Test-Path -LiteralPath $publishRoot) {
+  Remove-Item -LiteralPath $publishRoot -Recurse -Force
+}
+if (Test-Path -LiteralPath $outputRoot) {
+  Remove-Item -LiteralPath $outputRoot -Recurse -Force
+}
+
+dotnet publish $projectPath -c $Configuration -o $publishRoot
+if ($LASTEXITCODE -ne 0) {
+  throw "CultLib publish failed with exit code $LASTEXITCODE"
+}
+
+New-Item -ItemType Directory -Force -Path $pluginRoot | Out-Null
+Copy-Item -LiteralPath (Join-Path $templateRoot "package.json") -Destination $outputRoot
+Copy-Item -LiteralPath (Join-Path $templateRoot "README.md") -Destination $outputRoot
+
+$expectedAssemblies = @(
+  "ConcurrentCollections.dll",
+  "GameCult.Caching.dll",
+  "GameCult.Caching.MessagePack.dll",
+  "GameCult.Logging.dll",
+  "GameCult.Mesh.dll",
+  "GameCult.Networking.dll",
+  "Isopoh.Cryptography.Argon2.dll",
+  "Isopoh.Cryptography.Blake2b.dll",
+  "Isopoh.Cryptography.SecureArray.dll",
+  "LiteNetLib.dll",
+  "MessagePack.Annotations.dll",
+  "MessagePack.dll",
+  "Microsoft.Bcl.AsyncInterfaces.dll",
+  "Microsoft.Bcl.TimeProvider.dll",
+  "Microsoft.NET.StringTools.dll",
+  "R3.dll",
+  "System.Collections.Immutable.dll",
+  "System.ComponentModel.Annotations.dll",
+  "System.IO.Pipelines.dll",
+  "System.Runtime.CompilerServices.Unsafe.dll",
+  "System.Text.Encodings.Web.dll",
+  "System.Text.Json.dll",
+  "System.Threading.Channels.dll"
+)
+$publishedByName = @{}
+foreach ($assembly in Get-ChildItem -LiteralPath $publishRoot -Filter "*.dll") {
+  $publishedByName[$assembly.Name] = $assembly
+}
+foreach ($assemblyName in $expectedAssemblies) {
+  if (-not $publishedByName.ContainsKey($assemblyName)) {
+    throw "CultLib Unity package is missing expected assembly: $assemblyName"
+  }
+}
+
+Copy-Item -LiteralPath (Join-Path $templateRoot "Runtime\GameCult.CultLib.asmdef") `
+  -Destination (Join-Path $outputRoot "Runtime")
+foreach ($assemblyName in $expectedAssemblies) {
+  $assembly = $publishedByName[$assemblyName]
+  Copy-Item -LiteralPath $assembly.FullName -Destination $pluginRoot
+  $pdb = [System.IO.Path]::ChangeExtension($assembly.FullName, ".pdb")
+  if (Test-Path -LiteralPath $pdb) {
+    Copy-Item -LiteralPath $pdb -Destination $pluginRoot
+  }
+}
+
+$manifest = Get-Content -LiteralPath (Join-Path $outputRoot "package.json") -Raw | ConvertFrom-Json
+Write-Host "CultLib Unity package: $outputRoot"
+Write-Host "Package: $($manifest.name)@$($manifest.version)"
+Write-Host "Managed assemblies: $($expectedAssemblies.Count)"
diff --git a/unity/org.gamecult.cultlib/README.md b/unity/org.gamecult.cultlib/README.md
new file mode 100644
index 00000000..20fd4597
--- /dev/null
+++ b/unity/org.gamecult.cultlib/README.md
@@ -0,0 +1,8 @@
+# CultLib for Unity
+
+This package is generated from the CultLib .NET projects. It carries the same
+CultCache, CultNet, and CultMesh assemblies consumed through NuGet by normal
+.NET applications, staged as Unity-compatible managed plugins.
+
+Build it with `scripts/build-unity-package.ps1`. Do not edit generated plugin
+assemblies in the package output.
diff --git a/unity/org.gamecult.cultlib/Runtime/GameCult.CultLib.asmdef b/unity/org.gamecult.cultlib/Runtime/GameCult.CultLib.asmdef
new file mode 100644
index 00000000..6a2d7707
--- /dev/null
+++ b/unity/org.gamecult.cultlib/Runtime/GameCult.CultLib.asmdef
@@ -0,0 +1,38 @@
+{
+  "name": "GameCult.CultLib",
+  "rootNamespace": "GameCult",
+  "references": [],
+  "includePlatforms": [],
+  "excludePlatforms": [],
+  "allowUnsafeCode": false,
+  "overrideReferences": true,
+  "precompiledReferences": [
+    "ConcurrentCollections.dll",
+    "GameCult.Caching.dll",
+    "GameCult.Caching.MessagePack.dll",
+    "GameCult.Logging.dll",
+    "GameCult.Mesh.dll",
+    "GameCult.Networking.dll",
+    "Isopoh.Cryptography.Argon2.dll",
+    "Isopoh.Cryptography.Blake2b.dll",
+    "Isopoh.Cryptography.SecureArray.dll",
+    "LiteNetLib.dll",
+    "MessagePack.Annotations.dll",
+    "MessagePack.dll",
+    "Microsoft.Bcl.AsyncInterfaces.dll",
+    "Microsoft.Bcl.TimeProvider.dll",
+    "Microsoft.NET.StringTools.dll",
+    "R3.dll",
+    "System.Collections.Immutable.dll",
+    "System.ComponentModel.Annotations.dll",
+    "System.IO.Pipelines.dll",
+    "System.Runtime.CompilerServices.Unsafe.dll",
+    "System.Text.Encodings.Web.dll",
+    "System.Text.Json.dll",
+    "System.Threading.Channels.dll"
+  ],
+  "autoReferenced": true,
+  "defineConstraints": [],
+  "versionDefines": [],
+  "noEngineReferences": true
+}
diff --git a/unity/org.gamecult.cultlib/package.json b/unity/org.gamecult.cultlib/package.json
new file mode 100644
index 00000000..12e13589
--- /dev/null
+++ b/unity/org.gamecult.cultlib/package.json
@@ -0,0 +1,11 @@
+{
+  "name": "org.gamecult.cultlib",
+  "displayName": "CultLib",
+  "version": "1.0.3",
+  "unity": "2021.3",
+  "description": "CultCache, CultNet, and CultMesh managed runtime assemblies for Unity.",
+  "license": "MIT",
+  "author": {
+    "name": "GameCult"
+  }
+}