diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5ae3d7f..843cca0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,8 @@ User-visible changes to `voltage`, newest first. Each pull request that changes
 
 ## Unreleased
 
+- `-o` is short for `--output`, as in `voltage wallets list -o json`.
+
 ## 0.2.0 - 2026-10-22
 
 Commands that change something now only describe the change (exit code 6) unless `--execute` or `VOLTAGE_EXECUTE=1` asks to send them: add one of them to scripts that send payments or make other changes. Also new: `voltage context`, interactive pickers, `--no-input` and `--quiet`, and errors that name the next command.
diff --git a/docs/reference/global-flags.md b/docs/reference/global-flags.md
index 93cf9c3..4354655 100644
--- a/docs/reference/global-flags.md
+++ b/docs/reference/global-flags.md
@@ -20,7 +20,7 @@ Generated from the command definitions by `VOLTAGE_BLESS=1 cargo test`; do not e
 | Flag | Meaning |
 |---|---|
 | `--json` | Write a stable JSON result envelope |
-| `--output OUTPUT` | Output format (`table`, `json`, `ndjson`) |
+| `-o`, `--output OUTPUT` | Output format (`table`, `json`, `ndjson`) |
 | `--output-file PATH` | Save the complete response to a new owner-only file |
 | `--show-secrets` | Explicitly allow secrets in result output |
 | `-q`, `--quiet` | Hide optional progress and notices, not errors, results, or recovery IDs |
diff --git a/src/cli.rs b/src/cli.rs
index d368291..a6e5280 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -55,7 +55,7 @@ pub struct GlobalFlags {
     #[arg(long, global = true, help_heading = "Output")]
     pub json: bool,
     /// Output format
-    #[arg(long, global = true, value_enum, help_heading = "Output")]
+    #[arg(short = 'o', long, global = true, value_enum, help_heading = "Output")]
     pub output: Option<OutputFormat>,
     /// Save the complete response to a new owner-only file
     #[arg(long, global = true, value_name = "PATH", help_heading = "Output")]
@@ -1381,6 +1381,17 @@ mod tests {
         );
     }
 
+    #[test]
+    fn short_o_selects_the_output_format_before_or_after_the_subcommand() {
+        for args in [
+            ["voltage", "-o", "json", "wallets", "list"],
+            ["voltage", "wallets", "list", "-o", "json"],
+        ] {
+            let invocation = Invocation::try_parse_from(args).unwrap();
+            assert_eq!(invocation.global.output, Some(OutputFormat::Json));
+        }
+    }
+
     #[test]
     fn global_flags_work_after_subcommand() {
         let invocation = Invocation::try_parse_from([