Barry, 50, who played Greg Brady on the series, married Ella Mary Matt Williams in 1999. The couple formally separated earlier this month and have a 2-year-old son, according to the divorce petition filed Tuesday in Superior Court.
Ella Williams requested sole custody and asked that her husband have visits only with a nanny present, according to the petition.
Barry Williams works in musical theater, makes public speaking tours and wrote a memoir of his experience working on "The Brady Bunch" titled "Growing Up Brady: I was a Teenage Greg."
It will be his second divorce. Williams was married to Diane Martin from 1990 to 1992.