Mackenzie Brooke Smith (born February 6, 2001) is an American actress, most notable for her recurring role on Terminator: The Sarah Connor Chronicles as Savannah, the daughter of Catherine Weaver.

Smith has also guest starred in such television series as Grey's Anatomy, 100 Things to Do Before High School, Desperate Housewives and The Middle.

She had a small role in Road to the Altar as Brooke, a girl who plays with her sister in a hair and makeup shop.

In recent years, Smith has appeared as supporting characters in films such as A Winter Rose, The Family Fang, which was directed by Jason Bateman, and the thriller anthology Phobias, where she acted alongside Lauren Miller Rogen.

Her most notable work in television as a teenager and adult include the recurring role of Martha in 100 Things to Do Before High School, and guest starring as Ella Nelstadt in Grey's Anatomy.