The 33-year-old won the top prize in the team figure skating event at the Pyeongchang Games, performing alongside his partner Meagan Duhamel.
Radford joined Australian diver Matthew Mitcham as the only openly gay Olympic champions to date.
When he was selected to go to the games last month, Rippon became the first openly gay U.S. athlete to be selected to participate in the Winter Olympics.
But it was Radford's team who earned first place, with the skater winning gold alongside Gabrielle Daleman, Patrick Chan, Kaetlyn Osmond, Tessa Virtue and Scott Moir. He went on to win the World Championships with Duhamel in 2015.
He wrote: "This is awesome!" But Radford's win signals a major first in the Winter Games, which had previously hosted LGBTQ athletes, but never a gold medalist.
This is Radford's second Olympics, but his first as an openly gay man. Radford came out in 2014 in an exclusive interview with Outsports.
"I never had to worry about developing an off-ice relationship".
Rippon was a bundle of nerves after his performance this weekend: "I want to throw up". Not just bullying but people who just thought I couldn't make it, people in skating who don't like how Meagan and I skate, people who say we don't deserve the marks we get.
After the event, he said, 'I don't think I've ever been so nervous at 10 a.m.in my life, ' reports USA Today. "And all of Canada is proud of you!"
"O Canada our home and native land...".