Stephen Arthur Stills (born January 3, 1945) is an American multi-instrumentalist and singer/songwriter best known for his work with Buffalo Springfield and Crosby, Stills & Nash (and Young). He has performed on a professional level in several other bands as well as maintaining a solo career at the same time.

Stills was ranked #28 in Rolling Stone Magazine's 2003 list of "The 100 Greatest Guitarists of All Time" and #47 in the 2011 list. Stills became the first person to be inducted twice on the same night into the Rock and Roll Hall of Fame for his work with CSN and Buffalo Springfield.