George Lyman Paine Jr. (November 16, 1901 – July 1, 1978), was an American architect and radical left activist.

In 1926–1932, while living in New York City, the Paines became known for their apartment socials; one frequent social attendee, Mary Bancroft, wrote in her autobiography about her friend Ruth Forbes Paine's husband: "Lyman, ... was interested in what he termed 'The Ultimate Reality', which I interpreted as my old friend, 'Truth'.

Lyman and I had endless discussions about this ultimate reality while sipping highballs of bathtub gin and ginger ale.

When Johnson-Forest founder C. L. R. James left the group in 1962, the Paines remained with the Committee and the Boggses.

George Lyman Paine Jr died on July 1, 1978, while living in the County of Los Angeles, California, at the age of 76, and his 2nd Wife, Frances 'Freddy' Drake Paine, died on May 3, 1999, also while living in California.