Corsair can refer to:

• a pirate who used to operate with a commission from a government, see privateer
• a French airline, see: Corsair (airline)
• several aircraft of the US Navy:
  • the O2U Corsair
  • the F4U Corsair
  • the A-7 Corsair II
• a kind of fireworks
• a poem, The Corsair, by Lord Byron
• a large manufacturer of computer memory (Random Access Memory)