Gertrude Tonkonogy Friedberg (died September 17, 1989, aged 81) was an American playwright and author.
Friedberg wrote two Broadway plays, Town House which was based on stories by John Cheever, and Three-Cornered-Moon which starred Ruth Gordon and Brian Donlevy, and was later made into a film of the same name. Friedberg also published several humorous short stories and a science-fiction novel for Ace Science Fiction Specials in 1966, entitled Revolving Boy.
Friedberg had two children, Richard and Barbara. Her siblings included Eugene Tonkonogy, the successful real estate entrepreneur and owner of the Caribbean Island Marina Cay.