Shayne Robert Topp is an American YouTuber, comedian, actor, podcaster, and host. He is most known for starring in Dear Lemon Lima and his work on the YouTube sketch-comedy collective Smosh, of which he has been a cast member since 2015 and the co-host of its podcast Smosh Mouth (2023–present). He is also known for his roles as Shayne Zabo on the Disney Channel series So Random! (2011–2012), and as Matt Bradley in seasons 4–10 on the ABC series The Goldbergs (2017–2023).