diff --git a/Makefile b/Makefile
index 973fd19..800abce 100644
--- a/Makefile
+++ b/Makefile
@@ -76,6 +76,11 @@ install-config:
 	cp vietc.toml ~/.config/vietc/config.toml
 	@echo "Config installed to ~/.config/vietc/config.toml"
 
+# Build .deb package (requires dpkg-deb)
+deb:
+	VERSION=$$(grep '^version' engine/Cargo.toml | head -1 | sed 's/.*"\(.*\)"/\1/') && \
+	bash packaging/deb/build-deb.sh "$$VERSION"
+
 # Build AppImage (requires appimagetool or linuxdeploy)
 appimage:
 	VERSION=$$(grep '^version' engine/Cargo.toml | head -1 | sed 's/.*"\(.*\)"/\1/') && \
diff --git a/packaging/deb/build-deb.sh b/packaging/deb/build-deb.sh
new file mode 100755
index 0000000..1aaa8e4
--- /dev/null
+++ b/packaging/deb/build-deb.sh
@@ -0,0 +1,170 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
+VERSION="${1:-0.1.0}"
+PACKAGE="vietc_${VERSION}-1_amd64"
+STAGING="$SCRIPT_DIR/$PACKAGE"
+
+echo "=== Building Viet+ .deb package v${VERSION} ==="
+
+# Build binaries (all features: x11 + wayland)
+echo "[1/5] Building binaries..."
+cargo build --release --features "x11,wayland" --manifest-path "$PROJECT_ROOT/Cargo.toml"
+(cd "$PROJECT_ROOT/ui" && cargo build --release)
+echo "  Done."
+
+# Clean and create staging
+echo "[2/5] Creating staging directory..."
+rm -rf "$STAGING"
+mkdir -p "$STAGING/DEBIAN"
+mkdir -p "$STAGING/usr/bin"
+mkdir -p "$STAGING/usr/lib/systemd/user"
+mkdir -p "$STAGING/etc/vietc"
+mkdir -p "$STAGING/usr/share/applications"
+mkdir -p "$STAGING/usr/share/icons/hicolor/256x256/apps"
+mkdir -p "$STAGING/usr/share/doc/vietc"
+mkdir -p "$STAGING/usr/share/metainfo"
+
+# Copy binaries
+echo "[3/5] Installing binaries..."
+cp "$PROJECT_ROOT/target/release/vietc" "$STAGING/usr/bin/"
+cp "$PROJECT_ROOT/target/release/vietc-cli" "$STAGING/usr/bin/"
+[ -f "$PROJECT_ROOT/ui/target/release/vietc-tray" ] && cp "$PROJECT_ROOT/ui/target/release/vietc-tray" "$STAGING/usr/bin/"
+
+# Desktop file
+cp "$PROJECT_ROOT/packaging/appimage/vietc.desktop" "$STAGING/usr/share/applications/"
+
+# Icon (SVG from AppImage build script)
+cat > "$STAGING/usr/share/icons/hicolor/256x256/apps/vietc.svg" << 'SVGEOF'
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 256 256" width="256" height="256">
+  <rect x="20" y="60" width="216" height="140" rx="16" fill="#2d2d2d" stroke="#1a1a1a" stroke-width="4"/>
+  <rect x="36" y="76" width="184" height="108" rx="8" fill="#3d3d3d"/>
+  <rect x="48" y="88" width="24" height="20" rx="3" fill="#f0f0f0"/>
+  <rect x="78" y="88" width="24" height="20" rx="3" fill="#f0f0f0"/>
+  <rect x="108" y="88" width="24" height="20" rx="3" fill="#f0f0f0"/>
+  <rect x="138" y="88" width="24" height="20" rx="3" fill="#f0f0f0"/>
+  <rect x="168" y="88" width="24" height="20" rx="3" fill="#f0f0f0"/>
+  <rect x="198" y="88" width="24" height="20" rx="3" fill="#f0f0f0"/>
+  <rect x="54" y="114" width="24" height="20" rx="3" fill="#f0f0f0"/>
+  <rect x="84" y="114" width="24" height="20" rx="3" fill="#f0f0f0"/>
+  <rect x="114" y="114" width="24" height="20" rx="3" fill="#f0f0f0"/>
+  <rect x="144" y="114" width="24" height="20" rx="3" fill="#f0f0f0"/>
+  <rect x="174" y="114" width="24" height="20" rx="3" fill="#f0f0f0"/>
+  <rect x="60" y="140" width="24" height="20" rx="3" fill="#f0f0f0"/>
+  <rect x="90" y="140" width="24" height="20" rx="3" fill="#f0f0f0"/>
+  <rect x="120" y="140" width="24" height="20" rx="3" fill="#f0f0f0"/>
+  <rect x="150" y="140" width="24" height="20" rx="3" fill="#f0f0f0"/>
+  <rect x="180" y="140" width="42" height="20" rx="3" fill="#f0f0f0"/>
+  <rect x="72" y="166" width="112" height="16" rx="3" fill="#f0f0f0"/>
+  <circle cx="216" cy="48" r="28" fill="#da251d"/>
+  <text x="216" y="56" text-anchor="middle" fill="white" font-size="18" font-weight="bold" font-family="sans-serif">VN</text>
+</svg>
+SVGEOF
+
+# Documentation
+cp "$PROJECT_ROOT/README.md" "$STAGING/usr/share/doc/vietc/"
+cp "$PROJECT_ROOT/LICENSE" "$STAGING/usr/share/doc/vietc/"
+
+# Config
+cp "$PROJECT_ROOT/vietc.toml" "$STAGING/etc/vietc/config.toml"
+
+# Systemd user service
+cp "$PROJECT_ROOT/vietc.service" "$STAGING/usr/lib/systemd/user/"
+
+# AppStream metadata
+cat > "$STAGING/usr/share/metainfo/io.github.anomalyco.vietc.appdata.xml" << 'XML'
+<?xml version="1.0" encoding="UTF-8"?>
+<component type="console-application">
+  <id>io.github.anomalyco.vietc</id>
+  <name>Viet+</name>
+  <summary>Vietnamese Input Method for Linux</summary>
+  <description>
+    <p>Zero-configuration Vietnamese input method engine supporting Telex and VNI input methods. Works natively on both X11 and Wayland via evdev uinput injection.</p>
+  </description>
+  <metadata_license>MIT</metadata_license>
+  <project_license>MIT</project_license>
+  <url type="homepage">https://github.com/anomalyco/vietc</url>
+  <provides><binary>vietc</binary></provides>
+  <categories><category>Utility</category></categories>
+</component>
+XML
+
+# Lintian overrides
+mkdir -p "$STAGING/usr/share/lintian/overrides"
+cat > "$STAGING/usr/share/lintian/overrides/vietc" << 'LINTIAN'
+# Binaries are intentionally placed in /usr/bin without man pages
+# as Viet+ is a modern GUI application targeting Wayland/X11.
+vietc: no-manual-page *
+# Init script helpers are not needed; Viet+ uses systemd --user units.
+vietc: no-systemd-service-file-outside-lib
+# We bundle the tray alongside the daemon for convenience.
+vietc: wrong-section-according-to-package-name
+LINTIAN
+
+# Create control file
+echo "[4/5] Creating control file..."
+cat > "$STAGING/DEBIAN/control" << 'CONTROL'
+Package: vietc
+Version: VERSION_PLACEHOLDER
+Section: utils
+Priority: optional
+Architecture: amd64
+Depends: libc6 (>= 2.31), libevdev2 (>= 1.9.0)
+Recommends: libwayland-client0 (>= 1.20), libx11-6
+Maintainer: Khoa Vo <vndangkhoa@gmail.com>
+Description: Viet+ — Vietnamese Input Method for Linux
+ Zero-configuration Vietnamese input method engine supporting
+ Telex and VNI input methods. Works natively on both X11 and
+ Wayland via evdev uinput injection.
+CONTROL
+sed -i "s/VERSION_PLACEHOLDER/$VERSION/" "$STAGING/DEBIAN/control"
+
+# Conffiles
+echo "/etc/vietc/config.toml" > "$STAGING/DEBIAN/conffiles"
+
+# Maintainer scripts
+cat > "$STAGING/DEBIAN/postinst" << 'POSTINST'
+#!/bin/sh
+set -e
+case "$1" in
+  configure)
+    if command -v systemctl >/dev/null 2>&1; then
+      systemctl --system daemon-reload >/dev/null 2>&1 || true
+    fi
+    ;;
+esac
+POSTINST
+chmod 755 "$STAGING/DEBIAN/postinst"
+
+cat > "$STAGING/DEBIAN/prerm" << 'PRERM'
+#!/bin/sh
+set -e
+case "$1" in
+  remove|upgrade|deconfigure)
+    if command -v systemctl >/dev/null 2>&1; then
+      systemctl --system daemon-reload >/dev/null 2>&1 || true
+    fi
+    ;;
+esac
+PRERM
+chmod 755 "$STAGING/DEBIAN/prerm"
+
+cat > "$STAGING/DEBIAN/postrm" << 'POSTRM'
+#!/bin/sh
+set -e
+case "$1" in
+  purge)
+    rm -rf /etc/vietc 2>/dev/null || true
+    ;;
+esac
+POSTRM
+chmod 755 "$STAGING/DEBIAN/postrm"
+
+# Build .deb
+echo "[5/5] Building .deb package..."
+fakeroot dpkg-deb --build "$STAGING" "$SCRIPT_DIR/vietc_${VERSION}-1_amd64.deb"
+echo ""
+echo "=== Package built: packaging/deb/vietc_${VERSION}-1_amd64.deb ==="