David Thorstad (October 15, 1941 – August 1, 2021) was an American political activist who co-founded or ran a number of homosexual rights groups following the Stonewall riots in 1969, including as a former president of New York's Gay Activists Alliance. He later engaged in pedophilia and pederasty activism with the North American Man/Boy Love Association (NAMBLA), of which he was a founding member.