Mathew Tyler Oakley (born 22 March 1989) is an American YouTuber, actor, activist, author and Twitch streamer. Much of Oakley's activism has been dedicated to LGBT youth, LGBT rights, as well as social issues including health care, education, and the prevention of suicide among LGBT youth. Oakley regularly posts material on various topics, including pop culture and humor.

Since uploading his first video in 2007 while a freshman at Michigan State University, his YouTube channel has garnered over 683 million views, and, at its peak, had over 8 million subscribers. He was featured in the 2014 Frontline investigative report "Generation Like", a follow-up on how teenagers are "directly interacting with pop culture" to the 2001 report, "The Merchants of Cool". SocialBlade, a website that rates YouTube and Instagram accounts, ranks his YouTube channel, As of February 1, 2021, with a grade "B", subscriber rank of 1,434th, video view rank at 7,022nd, and a SocialBlade rating of 345,254th. As of February 1, 2021 he also had more than 5.6 million followers on Twitter and 5.6 million on Instagram.

From March to October 2013, Oakley co-hosted a weekly pop-culture news update – "Top That!" – with Becca Frucht for PopSugar. From 2013 to 2014, he performed the voice of Mr. McNeely in five episodes of the comedy web series The Most Popular Girls in School. He has hundreds of thousands of followers on Facebook and Tumblr. In 2015, he released his first collection of humorous personal essays under the title Binge, via publishers Simon & Schuster.

Oakley was the host of The Tyler Oakley Show, which aired weekly on Ellen DeGeneres' ellentube platform. In 2017, he was named in Forbes "30 Under 30".Tyler Oakley, licensed under CC-BY-SA, full list of contributors on Wikipedia.