Brian Eric Bonsall (born December 3, 1981) is a former American child actor. He is best known for playing the youngest Keaton child, Andy, on the NBC sitcom Family Ties from 1986 through 1989. He is also known for his portrayal of Alexander Rozhenko, the son of Worf, on Star Trek: The Next Generation.
Bonsall was born in Torrance, California. He has one sister, Jennifer, and a step brother, Victor DiMattia who starred in films such as Radio Flyer, The Sandlot and Turner and Hooch. At the age of five, he won the role of Andy Keaton on the sitcom Family Ties. Bonsall won three Young Artist Awards for his performance on the series. He was also nominated for a Young Artist Award for his starring role in the made-for-TV movie Do You Know the Muffin Man? in 1990. He made his feature film debut in the horror film Mikey, playing the title role, a demonic young boy who terrorizes his adoptive parents.
He played Patrick Swayze's son in the 1993 film Father Hood. He then starred in the 1994 Disney comedy Blank Check. That same year, he co-starred with Bob Saget in the TV movie comedy Father and Scout. His other acting credits include the TV movie Mother Goose Rock 'n' Rhyme and guest appearances on television series such as The Super Mario Bros. Super Show! and The Young Riders.