Redshirt or Red Shirt may refer to:
- Redshirt (college sports)
- Redshirt (character), a stock "cannon fodder" character in fiction, particularly in Star Trek: The Original Series
- Redshirts (military history), one of the followers of Giuseppe Garibaldi
- Redshirts (military history), Oliver Cromwell's New Model Army
- The Red Shirts, South African shack dwellers' movement, Abahlali baseMjondolo
- Red Shirts, a paramilitary organization in Mexico in the 1930's
- Kuilix, a Pend d'Oreilles woman whose name meant "Red Shirt" or "Red One"
- Delphine Red Shirt, an Oglala Lakota Sioux writer
- Red Shirt, South Dakota
- Red Shirt (Factory), a post civil war Southern organization
- Red Shirts (South Carolina), supporters of Wade Hampton in South Carolina for the gubernatorial election of 1876
- Khudai Khidmatgar, a non-violent movement of Pashtuns against the British Empire in the North-West Frontier Province of Pakistan
- Red Shirt School of Photography, a growing trend in the 1950s, pioneered by National Geographic photographers, to have subjects wear overly colourful clothes
- RedShirt, an encryption scheme used in games by Introversion Software
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