Brett Johnson (born in April 1970 in Brisbane, Australia) was an actor in the 1980's who was known for providing the voice of Charlie Brown during the 1985 episodes of The Charlie Brown and Snoopy Show and in the Peanuts specials, It's Flashbeagle, Charlie Brown and Snoopy's Getting Married, Charlie Brown. He also did the voice of Calvin in the Disney animated series Adventures of the Gummi Bears.
Johnson did two television movies and starred in the films Uncommon Valor, Invaders from Mars and The Karate Kid, Part II. He did voice-over work for the 1985 television film Happily Ever After and the television series Agro's Cartoon Connection.
He also guest-starred on television series including The New Leave it to Beaver, Mr. Belvedere and Small Wonder.