diff --git a/cmd/bd/show.go b/cmd/bd/show.go
index af885828..0ea31106 100644
--- a/cmd/bd/show.go
+++ b/cmd/bd/show.go
@@ -972,6 +972,10 @@ var closeCmd = &cobra.Command{
 	Run: func(cmd *cobra.Command, args []string) {
 		CheckReadonly("close")
 		reason, _ := cmd.Flags().GetString("reason")
+		// Check --resolution alias if --reason not provided
+		if reason == "" {
+			reason, _ = cmd.Flags().GetString("resolution")
+		}
 		if reason == "" {
 			reason = "Closed"
 		}
@@ -1411,6 +1415,8 @@ func init() {
 	rootCmd.AddCommand(editCmd)
 
 	closeCmd.Flags().StringP("reason", "r", "", "Reason for closing")
+	closeCmd.Flags().String("resolution", "", "Alias for --reason (Jira CLI convention)")
+	_ = closeCmd.Flags().MarkHidden("resolution") // Hidden alias for agent/CLI ergonomics
 	closeCmd.Flags().Bool("json", false, "Output JSON format")
 	closeCmd.Flags().BoolP("force", "f", false, "Force close pinned issues")
 	closeCmd.Flags().Bool("continue", false, "Auto-advance to next step in molecule")
diff --git a/cmd/bd/testdata/close_resolution_alias.txt b/cmd/bd/testdata/close_resolution_alias.txt
new file mode 100644
index 00000000..fe48f164
--- /dev/null
+++ b/cmd/bd/testdata/close_resolution_alias.txt
@@ -0,0 +1,16 @@
+# Test bd close --resolution alias (GH#721)
+# Jira CLI convention: --resolution instead of --reason
+bd init --prefix test
+
+# Create issue
+bd create 'Issue to close with resolution'
+cp stdout issue.txt
+exec sh -c 'grep -oE "test-[a-z0-9]+" issue.txt > issue_id.txt'
+
+# Close using --resolution alias
+exec sh -c 'bd close $(cat issue_id.txt) --resolution "Fixed via resolution alias"'
+stdout 'Closed test-'
+
+# Verify close_reason is set correctly
+exec sh -c 'bd show $(cat issue_id.txt) --json'
+stdout 'Fixed via resolution alias'