Barry William Blenkhorn born September 30, 1954, better known by his stage name Barry Williams, is an American actor. He is known for his role as the eldest of the Brady sons, Greg Brady, on the ABC television series The Brady Bunch 1969–1974 a role he reprised in several sequels and spin-offs including the animated series The Brady Kids 1972–1973, the variety series The Brady Bunch Hour (1976–1977) and the television films The Brady Girls Get Married 1981and A Very Brady Christmas (1988) and the reality television series A Very Brady Renovation 2019.

Best known for playing oldest son Greg Brady on the popular television series The Brady Bunch. Following its cancellation, he continued to appear in guest roles on television.

He made his Broadway debut in the musical Romance/Romance in 1988. He acted in the films Wild in the Streets (1968) and The Brady Bunch Movie 1995. Williams acted in shows such as Marcus Welby, M.D., Mission: Impossible, Murder, She Wrote, Full House, That 70s Show, and Scrubs. In 2022, he appeared on The Masked Singer, and appeared on season 32 of the ABC reality competition series Dancing with the Stars in 2023.