The word redhead can mean several things:

• A person with red hair.
• The North American Redhead duck, Aythya americana
• A colloquial name for the immatures and adult females (i.e., any non-adult male) of some other ducks, notably Smew and mergansers
• The North American Red-headed Woodpecker, Melanerpes erythrocephalus
• The milkweed Asclepias curassavica
• A "redhead" is also a kind of stage light (800W tungsten light): see theatrical lighting
• Redhead was also a 1959 musical, for which Richard Kiley won the Best Actor Tony Award.
• See also Brian Redhead (1929-1994), BBC Radio presenter on the Today programme
• Redheads is a brand of matches sold in Australia.
• Redhead gauge used to measure vacuum