Tan can mean several things:
- tan is shorthand for the tangent trigonometric function.
- Tanning is the process of making leather from skin.
- Sun tanning is the browning of light-colored skin by exposure of the bare skin to sunshine.
- Tan is a Chinese family name 譚,谭,覃,談,郯,檀 (in Mandarin) or 陳 (in Taisan).
- Tan is a character in the Fusion comic book.