Cocker may mean:
- Cocker, One who follows the sport of cockfighting
- Cocker Spaniel, a dog
- River Cocker, Cumbria, a river in the English county of Cumbria
- River Cocker (Lancashire), a river in the English county of Lancashire
- Edward Cocker (1631-1676), English engraver, who also taught writing and arithmetic
- Jarvis Cocker (b. 1963), English musician, frontman of Pulp
- Joe Cocker (b. 1944), English rock/blues singer
- Linzey Cocker (b. 1987), English actress
- Mark Cocker (b. 1959), British author and naturalist
- Syl Cheney-Cocker (b. 1945), Sierra Leonean poet, novelist, and journalist
- W. D. Cocker (1882 – 1970), Scottish poet
- Abbreviation of Autococker, a paintball marker.