Joseph David Keery (born April 24, 1992), known professionally in music as Djo, is an American actor and musician. He became known for playing Steve Harrington in the science fiction series Stranger Things (2016–present), and has since starred in the comedy film Free Guy (2021) and in the fifth season of the crime drama series Fargo (2023–2024).

As a musician, Keery was a member of the psychedelic rock band Post Animal. Following his departure from the band, he embarked on a solo career, and released the studio albums Twenty Twenty (2019) and Decide (2022). The latter spawned the sleeper hit and his first Billboard Hot 100 entry, "End of Beginning", after it became viral on TikTok in 2024. His third album, The Crux, will be released in April 2025.