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".