Tim Gill (born October 18, 1953) is an American computer software programmer, entrepreneur, philanthropist, and LGBTQ rights activist. He was among the first openly gay people to be on the Forbes 400 list of America's richest people. He is the founder and co-chair of the Gill Foundation, a private Denver-based philanthropic organization supporting efforts to secure nationwide civil rights for LGBTQ Americans. As of 2019, he was the single largest individual donor to the LGBTQ rights movement in U.S. history, having personally committed more than $500 million since the early 1990s.