Marmion may refer to:
- People
- Bill Marmion, Australian politician
- Columba Marmion (1858–1923), Irish abbot
- Robert Marmion (died 1218), English judge
- Shackerley Marmion (1603–1639), English dramatist
- Simon Marmion (1425-1489), French painter
- William Marmion (1845–1896), Australian politician
- Places
- Fontenay-le-Marmion a commune in France
- Marmion, Western Australia, a suburb of Perth
- Marmion Lake in Canada
- Marmion Tower, in West Tanfield, North Yorkshire
- Other
- Marmion (poem), an epic poem by Walter Scott about the Battle of Flodden
- Marmion Academy, a Catholic high school in Illinois