Tammy Blanchard (born December 14, 1976) is an American actress and singer. She has worked primarily in films and television, making her professional debut in the soap opera Guiding Light. For her first stage appearance, she played the role of Louise/Gypsy in the 2003 Broadway revival of the musical Gypsy, for which she earned both a Tony Award nomination and a Theatre World Award.

She received a Primetime Emmy Award for Outstanding Supporting Actress in a Miniseries or a Movie for her portrayal of a teenage Judy Garland in the television film Life with Judy Garland: Me and My Shadows. She also appeared as Hedy LaRue in the 2011 Broadway revival of How to Succeed in Business Without Really Trying and was nominated for a 2011 Tony Award for Featured Actress in a Musical for the role.