Roscoe Wayne Marquand is an American actor. He has played Aaron on the television series The Walking Dead (2015–2022), Red Skull and Ultron in various projects connected to the Marvel Cinematic Universe, and voices numerous characters in the animated television series Invincible (2021–present).

Aaron is a fictional character from the comic book series The Walking Dead and television series of the same name. He is portrayed by Ross Marquand in the television series.