diff --git a/README.md b/README.md
index c9d8186..cf4091c 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,31 @@ make build      # Build from source
 make install    # Install globally (optional)
 ```
 
+## Shell Completion
+
+Enable tab completion for commands, services, and arguments:
+
+```bash
+# Bash
+source <(xcli completion bash)
+
+# To load completions for each session (Linux):
+xcli completion bash > /etc/bash_completion.d/xcli
+
+# To load completions for each session (macOS):
+xcli completion bash > $(brew --prefix)/etc/bash_completion.d/xcli
+
+# Zsh
+echo "autoload -U compinit; compinit" >> ~/.zshrc  # Enable completion (once)
+xcli completion zsh > "${fpath[1]}/_xcli"
+
+# Fish
+xcli completion fish | source
+
+# To load completions for each session:
+xcli completion fish > ~/.config/fish/completions/xcli.fish
+```
+
 ## Quick Start
 
 ```bash
diff --git a/cmd/xcli/main.go b/cmd/xcli/main.go
index 459b7f2..a070554 100644
--- a/cmd/xcli/main.go
+++ b/cmd/xcli/main.go
@@ -98,6 +98,7 @@ func main() {
 	// Add root-level commands
 	rootCmd.AddCommand(commands.NewInitCommand(log, configPath))
 	rootCmd.AddCommand(commands.NewConfigCommand(log, configPath))
+	rootCmd.AddCommand(commands.NewCompletionCommand())
 
 	// Add stack commands
 	rootCmd.AddCommand(commands.NewLabCommand(log, configPath))
diff --git a/pkg/commands/completion.go b/pkg/commands/completion.go
new file mode 100644
index 0000000..098b157
--- /dev/null
+++ b/pkg/commands/completion.go
@@ -0,0 +1,69 @@
+package commands
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+// NewCompletionCommand creates the completion command for generating shell completion scripts.
+func NewCompletionCommand() *cobra.Command {
+	return &cobra.Command{
+		Use:   "completion [bash|zsh|fish|powershell]",
+		Short: "Generate shell completion scripts",
+		Long: fmt.Sprintf(`Generate shell completion scripts for xcli.
+
+To load completions:
+
+Bash:
+  $ source <(%[1]s completion bash)
+
+  # To load completions for each session, execute once:
+  # Linux:
+  $ %[1]s completion bash > /etc/bash_completion.d/%[1]s
+  # macOS:
+  $ %[1]s completion bash > $(brew --prefix)/etc/bash_completion.d/%[1]s
+
+Zsh:
+  # If shell completion is not already enabled in your environment,
+  # you will need to enable it. You can execute the following once:
+  $ echo "autoload -U compinit; compinit" >> ~/.zshrc
+
+  # To load completions for each session, execute once:
+  $ %[1]s completion zsh > "${fpath[1]}/_%[1]s"
+
+  # You will need to start a new shell for this setup to take effect.
+
+Fish:
+  $ %[1]s completion fish | source
+
+  # To load completions for each session, execute once:
+  $ %[1]s completion fish > ~/.config/fish/completions/%[1]s.fish
+
+PowerShell:
+  PS> %[1]s completion powershell | Out-String | Invoke-Expression
+
+  # To load completions for every new session, run:
+  PS> %[1]s completion powershell > %[1]s.ps1
+  # and source this file from your PowerShell profile.
+`, "xcli"),
+		DisableFlagsInUseLine: true,
+		ValidArgs:             []string{"bash", "zsh", "fish", "powershell"},
+		Args:                  cobra.MatchAll(cobra.ExactArgs(1), cobra.OnlyValidArgs),
+		RunE: func(cmd *cobra.Command, args []string) error {
+			switch args[0] {
+			case "bash":
+				return cmd.Root().GenBashCompletion(os.Stdout)
+			case "zsh":
+				return cmd.Root().GenZshCompletion(os.Stdout)
+			case "fish":
+				return cmd.Root().GenFishCompletion(os.Stdout, true)
+			case "powershell":
+				return cmd.Root().GenPowerShellCompletionWithDesc(os.Stdout)
+			default:
+				return fmt.Errorf("unsupported shell: %s", args[0])
+			}
+		},
+	}
+}
diff --git a/pkg/commands/completion_helpers.go b/pkg/commands/completion_helpers.go
new file mode 100644
index 0000000..eb5e249
--- /dev/null
+++ b/pkg/commands/completion_helpers.go
@@ -0,0 +1,92 @@
+package commands
+
+import (
+	"io"
+
+	"github.com/ethpandaops/xcli/pkg/config"
+	"github.com/ethpandaops/xcli/pkg/constants"
+	"github.com/ethpandaops/xcli/pkg/orchestrator"
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+)
+
+// completeServices returns a ValidArgsFunction that completes service names.
+// It loads the config and creates an orchestrator to get the dynamic service list.
+func completeServices(configPath string) func(*cobra.Command, []string, string) ([]string, cobra.ShellCompDirective) {
+	return func(_ *cobra.Command, args []string, _ string) ([]string, cobra.ShellCompDirective) {
+		// Don't complete if we already have an argument (for single-arg commands)
+		if len(args) > 0 {
+			return nil, cobra.ShellCompDirectiveNoFileComp
+		}
+
+		// Create a silent logger for completion (no output)
+		log := logrus.New()
+		log.SetOutput(io.Discard)
+
+		// Try to load config - fail gracefully
+		labCfg, cfgPath, err := config.LoadLabConfig(configPath)
+		if err != nil {
+			return nil, cobra.ShellCompDirectiveNoFileComp
+		}
+
+		// Try to create orchestrator - fail gracefully
+		orch, err := orchestrator.NewOrchestrator(log, labCfg, cfgPath)
+		if err != nil {
+			return nil, cobra.ShellCompDirectiveNoFileComp
+		}
+
+		return orch.GetValidServices(), cobra.ShellCompDirectiveNoFileComp
+	}
+}
+
+// completeModes returns a ValidArgsFunction that completes mode values.
+func completeModes() func(*cobra.Command, []string, string) ([]string, cobra.ShellCompDirective) {
+	return func(_ *cobra.Command, args []string, _ string) ([]string, cobra.ShellCompDirective) {
+		if len(args) > 0 {
+			return nil, cobra.ShellCompDirectiveNoFileComp
+		}
+
+		return []string{constants.ModeLocal, constants.ModeHybrid}, cobra.ShellCompDirectiveNoFileComp
+	}
+}
+
+// completeRebuildProjects returns a ValidArgsFunction that completes rebuild project names.
+func completeRebuildProjects() func(*cobra.Command, []string, string) ([]string, cobra.ShellCompDirective) {
+	return func(_ *cobra.Command, args []string, _ string) ([]string, cobra.ShellCompDirective) {
+		if len(args) > 0 {
+			return nil, cobra.ShellCompDirectiveNoFileComp
+		}
+
+		return []string{
+			"xatu-cbt",
+			"all",
+			"cbt",
+			"cbt-api",
+			"lab-backend",
+			"lab-frontend",
+			"prometheus",
+			"grafana",
+		}, cobra.ShellCompDirectiveNoFileComp
+	}
+}
+
+// completeReleasableProjects returns a ValidArgsFunction that completes releasable project names.
+// Supports multiple arguments since release accepts multiple projects.
+func completeReleasableProjects() func(*cobra.Command, []string, string) ([]string, cobra.ShellCompDirective) {
+	return func(_ *cobra.Command, args []string, _ string) ([]string, cobra.ShellCompDirective) {
+		// Filter out already-provided arguments
+		alreadyUsed := make(map[string]bool, len(args))
+		for _, arg := range args {
+			alreadyUsed[arg] = true
+		}
+
+		completions := make([]string, 0, len(constants.ReleasableProjects))
+		for _, project := range constants.ReleasableProjects {
+			if !alreadyUsed[project] {
+				completions = append(completions, project)
+			}
+		}
+
+		return completions, cobra.ShellCompDirectiveNoFileComp
+	}
+}
diff --git a/pkg/commands/lab_logs.go b/pkg/commands/lab_logs.go
index 17d2c81..bc88f78 100644
--- a/pkg/commands/lab_logs.go
+++ b/pkg/commands/lab_logs.go
@@ -14,9 +14,10 @@ func NewLabLogsCommand(log logrus.FieldLogger, configPath string) *cobra.Command
 	var follow bool
 
 	cmd := &cobra.Command{
-		Use:   "logs [service]",
-		Short: "Show lab service logs",
-		Long:  `Show logs for all lab services or a specific service.`,
+		Use:               "logs [service]",
+		Short:             "Show lab service logs",
+		Long:              `Show logs for all lab services or a specific service.`,
+		ValidArgsFunction: completeServices(configPath),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			labCfg, cfgPath, err := config.LoadLabConfig(configPath)
 			if err != nil {
diff --git a/pkg/commands/lab_mode.go b/pkg/commands/lab_mode.go
index 3ca3de6..3e612b1 100644
--- a/pkg/commands/lab_mode.go
+++ b/pkg/commands/lab_mode.go
@@ -39,7 +39,8 @@ After switching modes, restart the stack for changes to take effect:
 Examples:
   xcli lab mode local        # Switch to fully local mode
   xcli lab mode hybrid       # Switch to hybrid mode (requires external ClickHouse config)`,
-		Args: cobra.ExactArgs(1),
+		Args:              cobra.ExactArgs(1),
+		ValidArgsFunction: completeModes(),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			mode := args[0]
 			if mode != constants.ModeLocal && mode != constants.ModeHybrid {
diff --git a/pkg/commands/lab_rebuild.go b/pkg/commands/lab_rebuild.go
index ce11f2d..5ef0fac 100644
--- a/pkg/commands/lab_rebuild.go
+++ b/pkg/commands/lab_rebuild.go
@@ -70,7 +70,8 @@ Examples:
   xcli lab rebuild grafana           # Reload custom dashboards
 
 Note: All rebuild commands automatically restart their respective services if running.`,
-		Args: cobra.ExactArgs(1),
+		Args:              cobra.ExactArgs(1),
+		ValidArgsFunction: completeRebuildProjects(),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			project := args[0]
 
diff --git a/pkg/commands/lab_release.go b/pkg/commands/lab_release.go
index a055080..0f38c7c 100644
--- a/pkg/commands/lab_release.go
+++ b/pkg/commands/lab_release.go
@@ -65,7 +65,8 @@ Options:
   xcli lab release xatu-cbt --no-deps       # Skip dependency prompts
 
 Note: Requires GitHub CLI (gh) to be installed and authenticated.`,
-		Args: cobra.ArbitraryArgs,
+		Args:              cobra.ArbitraryArgs,
+		ValidArgsFunction: completeReleasableProjects(),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			return runRelease(cmd.Context(), log, args, stackFlag, bumpFlag,
 				yesFlag, !noWatchFlag, noDepsFlag, timeoutFlag)
diff --git a/pkg/commands/lab_restart.go b/pkg/commands/lab_restart.go
index cf330db..84faafa 100644
--- a/pkg/commands/lab_restart.go
+++ b/pkg/commands/lab_restart.go
@@ -13,10 +13,11 @@ import (
 // NewLabRestartCommand creates the lab restart command.
 func NewLabRestartCommand(log logrus.FieldLogger, configPath string) *cobra.Command {
 	return &cobra.Command{
-		Use:   "restart <service>",
-		Short: "Restart a lab service",
-		Long:  `Restart a specific lab service.`,
-		Args:  cobra.ExactArgs(1),
+		Use:               "restart <service>",
+		Short:             "Restart a lab service",
+		Long:              `Restart a specific lab service.`,
+		Args:              cobra.ExactArgs(1),
+		ValidArgsFunction: completeServices(configPath),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			labCfg, cfgPath, err := config.LoadLabConfig(configPath)
 			if err != nil {
diff --git a/pkg/commands/lab_start.go b/pkg/commands/lab_start.go
index df643d7..264fd58 100644
--- a/pkg/commands/lab_start.go
+++ b/pkg/commands/lab_start.go
@@ -26,7 +26,8 @@ Available services:
 Example:
   xcli lab start lab-backend
   xcli lab start cbt-mainnet`,
-		Args: cobra.ExactArgs(1),
+		Args:              cobra.ExactArgs(1),
+		ValidArgsFunction: completeServices(configPath),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			labCfg, cfgPath, err := config.LoadLabConfig(configPath)
 			if err != nil {
diff --git a/pkg/commands/lab_stop.go b/pkg/commands/lab_stop.go
index ece5eac..16b8c1d 100644
--- a/pkg/commands/lab_stop.go
+++ b/pkg/commands/lab_stop.go
@@ -26,7 +26,8 @@ Available services:
 Example:
   xcli lab stop lab-backend
   xcli lab stop cbt-mainnet`,
-		Args: cobra.ExactArgs(1),
+		Args:              cobra.ExactArgs(1),
+		ValidArgsFunction: completeServices(configPath),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			labCfg, cfgPath, err := config.LoadLabConfig(configPath)
 			if err != nil {