Dylan Rhodes O'Brien (born August 26, 1991) is an American actor. His first major role was as Stiles Stilinski in the MTV supernatural series Teen Wolf (2011–2017). He achieved further prominence for his lead role in the science fiction Maze Runner trilogy (2014–2018), which led to more film appearances.

O'Brien played Deepwater Horizon explosion survivor Caleb Holloway in the disaster film Deepwater Horizon (2016), fictional counterterrorist Mitch Rapp in the action thriller American Assassin (2017), and voiced the title character in the Transformers instalment Bumblebee (2018). He also played the lead role in the adventure film Love and Monsters (2020) and the horror film Caddo Lake (2024).