Tammy Blanchard is an American actress born on December 14, 1976, in Bayonne, New Jersey, U.S. She rose to prominence for her role as teenage Judy Garland in the critically acclaimed television film Life with Judy Garland: Me and My Shadows (2001), for which she received a Golden Globe Award nomination and a Primetime Emmy Award. Her other notable film roles were in The Good Shepherd (2006), Sybil (2007), Into the Woods (2014) and The Invitation (2015).

She made her professional acting debut on the soap opera Guiding Light in 1997, where she played spoiled rich girl Drew Jacobs. She played Marianne Mulvaney in the Lifetime television film We Were the Mulvaneys (2002). Blanchard earned a Tony Award nomination and a Theatre World Award for her work in her Broadway debut in the 2003 revival of the musical Gypsy, in which she played the title role opposite Bernadette Peters. in The Good Shepherd, she starred as the deaf lover of Matt Damon`s character. She appeared in the multi-star cast of the television docudrama Living Proof as the first woman to have been treated with the breast cancer drug Herceptin. She plays Amy Roberts, the widow of a murderer, in the made-for-television film Amish Grace. She appeared in the 2010 film Rabbit Hole alongside Nicole Kidman and Aaron Eckhart as Kidman`s sister. She portrayed the role of Audrey in the Off-Broadway revival of Little Shop of Horrors which opened at the Westside Theatre on October 17, 2019. In 2020, she acted in the film A Beautiful Day in the Neighborhood.