Alison Stewart is a fictional character on the daytime soap opera, As the World Turns. She was last portrayed by Marnie Schulenburg from March 23, 2007, to September 17, 2010. She also made a guest appearance on The Young and the Restless on February 22, 2007. Alison (again played by Schulenburg) also appeared in a 2007 web-only miniseries called L.A. Diaries which chronologically took place before the actress's first appearance on As the World Turns.