Joseph David Keery, also known professionally as Djo, is an American actor, singer, and musician. He first gained international recognition for playing Steve Harrington in the science fiction series Stranger Things (2016–2025), and has since starred in the comedy horror film Spree (2020), the comedy film Free Guy (2021), and in the fifth season of the crime comedy-drama series Fargo (2023–2024).

As a musician, Keery was a founding member of the psychedelic rock band Post Animal. He left the band in 2018 due to acting commitments. In 2019, he released his debut solo album, Twenty Twenty (2019), as Djo. His second album, Decide (2022), spawned the sleeper hit and his first Billboard Hot 100 entry, "End of Beginning", after it became viral on TikTok in 2024. Djo's third album, The Crux, was released in 2025. He rejoined Post Animal that same year and headlined the Back on You World Tour as Djo with Post Animal as openers.