Roy Bittan (born July 2, 1949) is an American keyboardist, best known as a member of Bruce Springsteen's E Street Band, which he joined on August 23, 1974. Bittan, nicknamed The Professor, plays the piano, organ, accordion and synthesizers.

Bittan has played on several dozen albums, not only for Springsteen but also David Bowie, Jackson Browne, Tracy Chapman, Chicago, Catie Curtis, Dire Straits, Peter Gabriel, Ian Hunter, Meat Loaf, Stevie Nicks, Bob Seger, Celine Dion, Patty Smyth, Jim Steinman, and Bonnie Tyler.