diff --git a/cmd/claws/main.go b/cmd/claws/main.go
index 4724a22c..4b1a468b 100644
--- a/cmd/claws/main.go
+++ b/cmd/claws/main.go
@@ -19,9 +19,10 @@ import (
 var version = "dev"
 
 func main() {
-	// Parse command line flags
 	opts := parseFlags()
 
+	propagateAllProxy()
+
 	// Apply CLI options to global config
 	cfg := config.Global()
 
@@ -102,30 +103,29 @@ func parseFlags() cliOptions {
 
 	args := os.Args[1:]
 	for i := 0; i < len(args); i++ {
-		arg := args[i]
-		switch {
-		case arg == "-p" || arg == "--profile":
+		switch args[i] {
+		case "-p", "--profile":
 			if i+1 < len(args) {
 				i++
 				opts.profile = args[i]
 			}
-		case arg == "-r" || arg == "--region":
+		case "-r", "--region":
 			if i+1 < len(args) {
 				i++
 				opts.region = args[i]
 			}
-		case arg == "-ro" || arg == "--read-only":
+		case "-ro", "--read-only":
 			opts.readOnly = true
-		case arg == "-e" || arg == "--env":
+		case "-e", "--env":
 			opts.envCreds = true
-		case arg == "-l" || arg == "--log-file":
+		case "-l", "--log-file":
 			if i+1 < len(args) {
 				i++
 				opts.logFile = args[i]
 			}
-		case arg == "-h" || arg == "--help":
+		case "-h", "--help":
 			showHelp = true
-		case arg == "-v" || arg == "--version":
+		case "-v", "--version":
 			showVersion = true
 		}
 	}
@@ -167,4 +167,36 @@ func printUsage() {
 	fmt.Println()
 	fmt.Println("Environment Variables:")
 	fmt.Println("  CLAWS_READ_ONLY=1|true   Enable read-only mode")
+	fmt.Println("  ALL_PROXY                Propagated to HTTP_PROXY/HTTPS_PROXY if not set")
+}
+
+// propagateAllProxy copies ALL_PROXY to HTTP_PROXY/HTTPS_PROXY if not set.
+// Go's net/http ignores ALL_PROXY, so we propagate it to the standard vars.
+func propagateAllProxy() {
+	allProxy := os.Getenv("ALL_PROXY")
+	if allProxy == "" {
+		return
+	}
+
+	var propagated []string
+
+	if os.Getenv("HTTPS_PROXY") == "" {
+		if err := os.Setenv("HTTPS_PROXY", allProxy); err != nil {
+			log.Warn("failed to set HTTPS_PROXY", "error", err)
+		} else {
+			propagated = append(propagated, "HTTPS_PROXY")
+		}
+	}
+
+	if os.Getenv("HTTP_PROXY") == "" {
+		if err := os.Setenv("HTTP_PROXY", allProxy); err != nil {
+			log.Warn("failed to set HTTP_PROXY", "error", err)
+		} else {
+			propagated = append(propagated, "HTTP_PROXY")
+		}
+	}
+
+	if len(propagated) > 0 {
+		log.Debug("propagated ALL_PROXY", "to", propagated)
+	}
 }
diff --git a/cmd/claws/proxy_test.go b/cmd/claws/proxy_test.go
new file mode 100644
index 00000000..06cfb8e4
--- /dev/null
+++ b/cmd/claws/proxy_test.go
@@ -0,0 +1,94 @@
+package main
+
+import (
+	"os"
+	"testing"
+)
+
+func TestPropagateAllProxy(t *testing.T) {
+	// Note: Only uppercase ALL_PROXY is supported.
+	// Lowercase all_proxy is intentionally not supported to match
+	// the AWS SDK behavior and keep the implementation simple.
+	// Go's net/http.ProxyFromEnvironment also only checks uppercase
+	// for HTTP_PROXY and HTTPS_PROXY on non-CGI environments.
+
+	proxyVars := []string{
+		"ALL_PROXY",
+		"HTTP_PROXY",
+		"HTTPS_PROXY",
+	}
+
+	tests := []struct {
+		name      string
+		envVars   map[string]string
+		wantHTTPS string
+		wantHTTP  string
+	}{
+		{
+			name:      "ALL_PROXY propagates to both HTTP and HTTPS",
+			envVars:   map[string]string{"ALL_PROXY": "socks5h://proxy:1080"},
+			wantHTTPS: "socks5h://proxy:1080",
+			wantHTTP:  "socks5h://proxy:1080",
+		},
+		{
+			name:      "HTTPS_PROXY already set - only HTTP propagated",
+			envVars:   map[string]string{"ALL_PROXY": "http://all", "HTTPS_PROXY": "http://existing"},
+			wantHTTPS: "http://existing",
+			wantHTTP:  "http://all",
+		},
+		{
+			name:      "HTTP_PROXY already set - only HTTPS propagated",
+			envVars:   map[string]string{"ALL_PROXY": "http://all", "HTTP_PROXY": "http://existing"},
+			wantHTTPS: "http://all",
+			wantHTTP:  "http://existing",
+		},
+		{
+			name:      "both already set - no propagation",
+			envVars:   map[string]string{"ALL_PROXY": "http://all", "HTTP_PROXY": "http://h", "HTTPS_PROXY": "http://s"},
+			wantHTTPS: "http://s",
+			wantHTTP:  "http://h",
+		},
+		{
+			name:      "no ALL_PROXY - no action",
+			envVars:   map[string]string{},
+			wantHTTPS: "",
+			wantHTTP:  "",
+		},
+		{
+			name:      "lowercase all_proxy not supported",
+			envVars:   map[string]string{"all_proxy": "http://proxy:8080"},
+			wantHTTPS: "",
+			wantHTTP:  "",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			clearEnvVars(t, proxyVars)
+			setEnvVars(t, tt.envVars)
+
+			propagateAllProxy()
+
+			if got := os.Getenv("HTTPS_PROXY"); got != tt.wantHTTPS {
+				t.Errorf("HTTPS_PROXY = %q, want %q", got, tt.wantHTTPS)
+			}
+			if got := os.Getenv("HTTP_PROXY"); got != tt.wantHTTP {
+				t.Errorf("HTTP_PROXY = %q, want %q", got, tt.wantHTTP)
+			}
+		})
+	}
+}
+
+func clearEnvVars(t *testing.T, keys []string) {
+	t.Helper()
+	for _, key := range keys {
+		os.Unsetenv(key)
+	}
+}
+
+func setEnvVars(t *testing.T, vars map[string]string) {
+	t.Helper()
+	for key, value := range vars {
+		t.Setenv(key, value)
+	}
+}