Merlyn Rees
- Birthday: 1920-12-18
- Deathday: 2006-01-05
- Place of birth: Cilfynydd, Wales
Merlyn Merlyn-Rees, Baron Merlyn-Rees, PC was a British Labour Party politician and Member of Parliament from 1963 until 1992. He served as Secretary of State for Northern Ireland and Home Secretary.
