Brian Eric Bonsall (born December 3, 1981) is an American rock musician, singer, guitarist and former child actor.

He is perhaps best known for his roles as Andrew "Andy" Keaton, the youngest child on the NBC sitcom Family Ties from 1986 until 1989, and Alexander Rozhenko, the son of Worf and K'ehleyr, on Star Trek: The Next Generation from 1992 to 1994.

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?

This caused controversy in the UK owing to its depiction of a child killer at a time when the murder of James Bulger had raised sensitivity about violent behavior by children.

In 1995, Bonsall retired from acting and moved with his mother and stepfather to Boulder, Colorado.

[9] In February, 2010, Bonsall was arrested on charges of using marijuana in violation of the terms of his release.