diff --git a/.forgejo/workflows/ci.yaml b/.forgejo/workflows/ci.yaml
index ff3d6bbb5b..59893e1e95 100644
--- a/.forgejo/workflows/ci.yaml
+++ b/.forgejo/workflows/ci.yaml
@@ -195,6 +195,27 @@ jobs:
         run: sh ci/x86_64-linux-release.sh
         timeout-minutes: 360
 
+  x86_64-openbsd-debug:
+    runs-on: [self-hosted, x86_64-openbsd]
+    steps:
+      - name: Checkout
+        uses: https://codeberg.org/ziglang/checkout@19af6bac491e2534a4687a50ee84fa7f13258d28
+        with:
+          fetch-depth: 0
+      - name: Build and Test
+        run: sh ci/x86_64-openbsd-debug.sh
+        timeout-minutes: 120
+  x86_64-openbsd-release:
+    runs-on: [self-hosted, x86_64-openbsd]
+    steps:
+      - name: Checkout
+        uses: https://codeberg.org/ziglang/checkout@19af6bac491e2534a4687a50ee84fa7f13258d28
+        with:
+          fetch-depth: 0
+      - name: Build and Test
+        run: sh ci/x86_64-openbsd-release.sh
+        timeout-minutes: 120
+
   x86_64-windows-debug:
     runs-on: [self-hosted, x86_64-windows]
     steps:
diff --git a/ci/x86_64-openbsd-debug.sh b/ci/x86_64-openbsd-debug.sh
new file mode 100755
index 0000000000..133c8dd4d6
--- /dev/null
+++ b/ci/x86_64-openbsd-debug.sh
@@ -0,0 +1,62 @@
+#!/bin/sh
+
+# Requires cmake ninja-build
+
+set -x
+set -e
+
+TARGET="x86_64-openbsd-none"
+MCPU="baseline"
+CACHE_BASENAME="zig+llvm+lld+clang-$TARGET-0.16.0-dev.2051+28b83e3b0"
+PREFIX="$HOME/deps/$CACHE_BASENAME"
+ZIG="$PREFIX/bin/zig"
+
+# Override the cache directories because they won't actually help other CI runs
+# which will be testing alternate versions of zig, and ultimately would just
+# fill up space on the hard drive for no reason.
+export ZIG_GLOBAL_CACHE_DIR="$PWD/zig-global-cache"
+export ZIG_LOCAL_CACHE_DIR="$PWD/zig-local-cache"
+
+mkdir build-debug
+cd build-debug
+
+export CC="$ZIG cc -target $TARGET -mcpu=$MCPU"
+export CXX="$ZIG c++ -target $TARGET -mcpu=$MCPU"
+
+cmake .. \
+  -DCMAKE_INSTALL_PREFIX="stage3-debug" \
+  -DCMAKE_PREFIX_PATH="$PREFIX" \
+  -DCMAKE_BUILD_TYPE=Debug \
+  -DZIG_TARGET_TRIPLE="$TARGET" \
+  -DZIG_TARGET_MCPU="$MCPU" \
+  -DZIG_STATIC=ON \
+  -DZIG_NO_LIB=ON \
+  -GNinja \
+  -DCMAKE_C_LINKER_DEPFILE_SUPPORTED=FALSE \
+  -DCMAKE_CXX_LINKER_DEPFILE_SUPPORTED=FALSE
+# https://github.com/ziglang/zig/issues/22213
+
+# Now cmake will use zig as the C/C++ compiler. We reset the environment variables
+# so that installation and testing do not get affected by them.
+unset CC
+unset CXX
+
+ninja install
+
+stage3-debug/bin/zig build test docs \
+  --maxrss ${ZSF_MAX_RSS:-0} \
+  -Dstatic-llvm \
+  -Dskip-non-native \
+  --search-prefix "$PREFIX" \
+  --zig-lib-dir "$PWD/../lib" \
+  --test-timeout 2m
+
+stage3-debug/bin/zig build \
+  --prefix stage4-debug \
+  -Denable-llvm \
+  -Dno-lib \
+  -Dtarget=$TARGET \
+  -Duse-zig-libcxx \
+  -Dversion-string="$(stage3-debug/bin/zig version)"
+
+stage4-debug/bin/zig test ../test/behavior.zig
diff --git a/ci/x86_64-openbsd-release.sh b/ci/x86_64-openbsd-release.sh
new file mode 100755
index 0000000000..535b1a1471
--- /dev/null
+++ b/ci/x86_64-openbsd-release.sh
@@ -0,0 +1,68 @@
+#!/bin/sh
+
+# Requires cmake ninja-build
+
+set -x
+set -e
+
+TARGET="x86_64-openbsd-none"
+MCPU="baseline"
+CACHE_BASENAME="zig+llvm+lld+clang-$TARGET-0.16.0-dev.2051+28b83e3b0"
+PREFIX="$HOME/deps/$CACHE_BASENAME"
+ZIG="$PREFIX/bin/zig"
+
+# Override the cache directories because they won't actually help other CI runs
+# which will be testing alternate versions of zig, and ultimately would just
+# fill up space on the hard drive for no reason.
+export ZIG_GLOBAL_CACHE_DIR="$PWD/zig-global-cache"
+export ZIG_LOCAL_CACHE_DIR="$PWD/zig-local-cache"
+
+mkdir build-release
+cd build-release
+
+export CC="$ZIG cc -target $TARGET -mcpu=$MCPU"
+export CXX="$ZIG c++ -target $TARGET -mcpu=$MCPU"
+
+cmake .. \
+  -DCMAKE_INSTALL_PREFIX="stage3-release" \
+  -DCMAKE_PREFIX_PATH="$PREFIX" \
+  -DCMAKE_BUILD_TYPE=Release \
+  -DZIG_TARGET_TRIPLE="$TARGET" \
+  -DZIG_TARGET_MCPU="$MCPU" \
+  -DZIG_STATIC=ON \
+  -DZIG_NO_LIB=ON \
+  -GNinja \
+  -DCMAKE_C_LINKER_DEPFILE_SUPPORTED=FALSE \
+  -DCMAKE_CXX_LINKER_DEPFILE_SUPPORTED=FALSE
+# https://github.com/ziglang/zig/issues/22213
+
+# Now cmake will use zig as the C/C++ compiler. We reset the environment variables
+# so that installation and testing do not get affected by them.
+unset CC
+unset CXX
+
+ninja install
+
+stage3-release/bin/zig build test docs \
+  --maxrss ${ZSF_MAX_RSS:-0} \
+  -Dstatic-llvm \
+  -Dskip-non-native \
+  --search-prefix "$PREFIX" \
+  --zig-lib-dir "$PWD/../lib" \
+  --test-timeout 2m
+
+# Ensure that stage3 and stage4 are byte-for-byte identical.
+stage3-release/bin/zig build \
+  --prefix stage4-release \
+  -Denable-llvm \
+  -Dno-lib \
+  -Doptimize=ReleaseFast \
+  -Dstrip \
+  -Dtarget=$TARGET \
+  -Duse-zig-libcxx \
+  -Dversion-string="$(stage3-release/bin/zig version)"
+
+# diff returns an error code if the files differ.
+echo "If the following command fails, it means nondeterminism has been"
+echo "introduced, making stage3 and stage4 no longer byte-for-byte identical."
+diff stage3-release/bin/zig stage4-release/bin/zig
diff --git a/lib/std/fs/test.zig b/lib/std/fs/test.zig
index a9fdab1ae0..63c51e6ed5 100644
--- a/lib/std/fs/test.zig
+++ b/lib/std/fs/test.zig
@@ -1130,6 +1130,7 @@ test "renameAbsolute" {
 
 test "openExecutable" {
     if (native_os == .wasi) return error.SkipZigTest;
+    if (native_os == .openbsd) return error.SkipZigTest;
 
     const io = testing.io;
 
@@ -1139,6 +1140,7 @@ test "openExecutable" {
 
 test "executablePath" {
     if (native_os == .wasi) return error.SkipZigTest;
+    if (native_os == .openbsd) return error.SkipZigTest;
 
     const io = testing.io;
     var buf: [Dir.max_path_bytes]u8 = undefined;
diff --git a/test/error_traces.zig b/test/error_traces.zig
index 9f1bcd027b..ef33a458c6 100644
--- a/test/error_traces.zig
+++ b/test/error_traces.zig
@@ -439,6 +439,7 @@ pub fn addCases(cases: *@import("tests.zig").ErrorTracesContext) void {
             .{ .powerpc64le, .linux },
             .{ .riscv64, .linux },
             .{ .s390x, .linux },
+            .{ .x86_64, .openbsd },
             .{ .x86_64, .windows },
             .{ .x86, .windows },
             .{ .x86_64, .macos },
diff --git a/test/standalone/libfuzzer/build.zig b/test/standalone/libfuzzer/build.zig
index 54cc977abe..ea3ae12e45 100644
--- a/test/standalone/libfuzzer/build.zig
+++ b/test/standalone/libfuzzer/build.zig
@@ -6,6 +6,7 @@ pub fn build(b: *std.Build) void {
     const optimize = b.standardOptimizeOption(.{});
 
     if (builtin.os.tag == .windows) return; // TODO: libfuzzer support for windows
+    if (builtin.os.tag == .openbsd) return; // https://codeberg.org/ziglang/zig/issues/30728
 
     const run_step = b.step("run", "Run executables");
     const exe = b.addExecutable(.{
diff --git a/test/standalone/self_exe_symlink/build.zig b/test/standalone/self_exe_symlink/build.zig
index 137848b953..061dd69f34 100644
--- a/test/standalone/self_exe_symlink/build.zig
+++ b/test/standalone/self_exe_symlink/build.zig
@@ -9,6 +9,8 @@ pub fn build(b: *std.Build) void {
     const optimize: std.builtin.OptimizeMode = .Debug;
     const target = b.graph.host;
 
+    if (target.result.os.tag == .openbsd) return; // realpath not supported
+
     const main = b.addExecutable(.{
         .name = "main",
         .root_module = b.createModule(.{