Alison Bartlett O'Reilly (born July 14, 1971) is a New York-based actress who has portrayed Gina Jefferson on Sesame Street since 1987, and has reprised the role in various related specials, direct-to-video productions, and The Adventures of Elmo in Grouchland.

Bartlett began her career as a child actress, appearing at the age of 12 as Joanne in the 1984 stage production of Landscape of The Body, co-starring Dann Florek and directed by Gary Sinise. Other stage credits include the role of Donna in the Broadway show Hurly Burly from 1985, and Off Broadway in Jersey City (1990).