diff --git a/.github/workflows/gossipsub-interop-pr.yml b/.github/workflows/gossipsub-interop-pr.yml
index 48643e9c5..58fc65101 100644
--- a/.github/workflows/gossipsub-interop-pr.yml
+++ b/.github/workflows/gossipsub-interop-pr.yml
@@ -18,6 +18,13 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
+      - name: Checkout eth-p2p-z
+        uses: actions/checkout@v4
+        with:
+          repository: zen-eth/eth-p2p-z
+          ref: feat/gossipsub
+          path: ../eth-p2p-z
+
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
@@ -32,6 +39,19 @@ jobs:
           curl https://nim-lang.org/choosenim/init.sh -sSf | sh -s -- -y
           echo "$HOME/.nimble/bin" >> $GITHUB_PATH
 
+      - name: Set up Zig 0.15.2
+        run: |
+          curl -fL https://ziglang.org/download/0.15.2/zig-x86_64-linux-0.15.2.tar.xz \
+            | sudo tar -xJ -C /usr/local
+          sudo ln -sf /usr/local/zig-x86_64-linux-0.15.2/zig /usr/local/bin/zig
+          zig version
+
+      - name: Cache Zig global packages
+        uses: actions/cache@v4
+        with:
+          path: ~/.cache/zig
+          key: zig-0.15.2
+
       - name: Install uv
         run: |
           curl -LsSf https://astral.sh/uv/install.sh | sh
@@ -52,7 +72,8 @@ jobs:
             netbase \
             python3 \
             python3-networkx \
-            xz-utils
+            xz-utils \
+            zlib1g-dev
 
           # Build and install Shadow v3.3.0 from source
           git clone --depth 1 --branch v3.3.0 https://github.com/shadow/shadow.git shadow-simulator
@@ -67,6 +88,11 @@ jobs:
         run: make test
         continue-on-error: true
 
+      - name: Run gossipsub interop tests (Zig)
+        working-directory: gossipsub-interop
+        run: make test-zig
+        continue-on-error: true
+
       - name: Upload Shadow output
         if: always()
         uses: actions/upload-artifact@v4
diff --git a/gossipsub-interop/Dockerfile b/gossipsub-interop/Dockerfile
new file mode 100644
index 000000000..36bba75e3
--- /dev/null
+++ b/gossipsub-interop/Dockerfile
@@ -0,0 +1,36 @@
+# Shadow network simulator + Zig build environment
+# Runs on linux/amd64 (Shadow requirement).
+#
+# Uses the pre-built shadowsim/shadow-ci image so we skip the ~1h Shadow
+# Rust compilation that was previously needed under QEMU on Apple Silicon.
+#
+# Build:
+#   docker build --platform linux/amd64 -t gossipsub-shadow .
+#
+# Run (from gossipsub-interop directory):
+#   docker run --rm --platform linux/amd64 \
+#     -v $(pwd):/work \
+#     -v /path/to/eth-p2p-z:/eth-p2p-z \
+#     -v $HOME/.cache/zig:/root/.cache/zig \
+#     gossipsub-shadow \
+#     bash /work/run-shadow.sh --node_count 4 --composition all-zig --scenario subnet-blob-msg
+
+FROM --platform=linux/amd64 shadowsim/shadow-ci:ubuntu-22.04-gcc-release
+
+# ── Extra system libraries needed by the Zig/C build ─────────────────────
+# zlib1g-dev: required by lsquic (zlib.h)
+RUN apt-get update && apt-get install -y \
+    zlib1g-dev \
+    git \
+    && rm -rf /var/lib/apt/lists/*
+
+# ── Zig 0.15.2 ────────────────────────────────────────────────────────────
+RUN curl -fL https://ziglang.org/download/0.15.2/zig-x86_64-linux-0.15.2.tar.xz \
+    | tar -xJ -C /usr/local \
+    && ln -s /usr/local/zig-x86_64-linux-0.15.2/zig /usr/local/bin/zig
+
+# ── uv (Python package manager for experiment scripts) ────────────────────
+RUN curl -LsSf https://astral.sh/uv/install.sh | sh
+ENV PATH="/root/.local/bin:${PATH}"
+
+WORKDIR /work
diff --git a/gossipsub-interop/Makefile b/gossipsub-interop/Makefile
index 90a60bf7b..b3d2dc033 100644
--- a/gossipsub-interop/Makefile
+++ b/gossipsub-interop/Makefile
@@ -26,6 +26,8 @@ binaries: nim-libp2p/gossipsub-bin
 	cd go-libp2p && go build -linkshared -o gossipsub-bin
 	cd rust-libp2p && cargo build
 	cd jvm-libp2p && ./gradlew installDist
+	zig build --build-file $(CURDIR)/../../eth-p2p-z/build.zig --prefix $(CURDIR)/zig-libp2p/zig-out -Doptimize=ReleaseFast -Dlibxev-backend=epoll
+	cp $(CURDIR)/zig-libp2p/zig-out/bin/gossipsub-bin $(CURDIR)/zig-libp2p/gossipsub-bin
 
 # Clean all generated shadow simulation files
 clean:
@@ -119,5 +121,13 @@ test-rust-only:
 	@uv run run.py --node_count 2 --composition rust --scenario "partial-messages-fanout" && uv run checks/partial_messages.py latest/
 
 
+test-zig:
+	# Testing all-zig subnet-blob-msg
+	@echo "Testing all-zig subnet-blob-msg"
+	@uv run run.py --node_count 4 --composition zig --scenario "subnet-blob-msg" && uv run checks/subnet_blob_msg.py latest/
 
-.PHONY: binaries all clean test test-rust-only test-go test-subnet-blob test-partial-messages
+test-zig-go:
+	@echo "Testing zig+go subnet-blob-msg"
+	@uv run run.py --node_count 16 --composition zig go --scenario "subnet-blob-msg" && uv run checks/subnet_blob_msg.py latest/
+
+.PHONY: binaries all clean test test-rust-only test-go test-subnet-blob test-partial-messages test-zig test-zig-go
diff --git a/gossipsub-interop/experiment.py b/gossipsub-interop/experiment.py
index 7ecca96fb..211418488 100644
--- a/gossipsub-interop/experiment.py
+++ b/gossipsub-interop/experiment.py
@@ -346,6 +346,7 @@ def scenario(
     "rust": "rust-libp2p/target/debug/rust-libp2p-gossip",
     "nim": "nim-libp2p/gossipsub-bin",
     "jvm": "jvm-libp2p/build/install/jvm-libp2p-gossip/bin/jvm-libp2p-gossip",
+    "zig": "zig-libp2p/gossipsub-bin",
 }
 
 
diff --git a/gossipsub-interop/run.py b/gossipsub-interop/run.py
index 90dfe111b..f1a7da2b2 100644
--- a/gossipsub-interop/run.py
+++ b/gossipsub-interop/run.py
@@ -57,9 +57,7 @@ def main():
 
         timestamp = datetime.datetime.now().strftime("%Y%m%d%H%M%S")
         composition_label = "-".join(args.composition)
-        args.output_dir = f"{args.scenario}-{args.node_count}-{composition_label}-{
-            args.seed
-        }-{timestamp}-{git_describe}.data"
+        args.output_dir = f"{args.scenario}-{args.node_count}-{composition_label}-{args.seed}-{timestamp}-{git_describe}.data"
 
     if not os.path.isabs(args.output_dir):
         args.output_dir = os.path.join(shadow_outputs_dir, args.output_dir)
diff --git a/gossipsub-interop/zig-libp2p/.gitignore b/gossipsub-interop/zig-libp2p/.gitignore
new file mode 100644
index 000000000..f204361ff
--- /dev/null
+++ b/gossipsub-interop/zig-libp2p/.gitignore
@@ -0,0 +1,4 @@
+gossipsub-interop/zig-libp2p/.zig-cache/
+zig-pkg/
+.zig-cache/
+zig-out/