1920–21 County Antrim Shield

The 1920–21 County Antrim Shield was the 32nd edition of the County Antrim Shield, a cup competition in Irish football.

Glentoran won the tournament for the 6th time, defeating Distillery 1–0 in the third final replay at Windsor Park, after the original final and two subsequent replays finished in draws.

Quarter-finals

 * }

Semi-finals

 * }

Replays

 * }

Second replay

 * }