Dacre Kayd Montgomery-Harvey (/ˈdeɪkər/; born 22 November 1994) is an Australian actor. Montgomery began acting in short films as a teenager before making his feature film debut in the adventure comedy A Few Less Men (2017). In 2017, Montgomery starred as Jason Scott / Red Ranger in the superhero film Power Rangers and began playing Billy Hargrove in the Netflix science fiction horror series Stranger Things (2017–2022).

His performance in the latter earned him critical acclaim and various awards nominations. He has since starred in the Christmas horror film Better Watch Out (2017) and the romantic comedy The Broken Hearts Gallery (2020) and portrayed Steve Binder in Baz Luhrmann's Elvis (2022).