Niagara
- Blwyddyn: 1953
- Gwlad: United States of America
- Genre: Thriller, Crime
- Stiwdio: 20th Century Fox
- Allweddair: infidelity, husband wife relationship, clock tower, honeymoon, self-defense, postcard, morgue, delirium, niagara falls, waterfall, film noir, murder, tour guide, fear, pursuit, screaming, unconsciousness, adulteress, unfaithful wife
- Cyfarwyddwr: Henry Hathaway
- Cast: Marilyn Monroe, Joseph Cotten, Jean Peters, Max Showalter, Denis O'Dea, Richard Allan