Oskar Smartt (born 26 October 2005) is a professional Australian rules footballer with the Essendon Football Club in the Australian Football League (AFL).
Having played his junior football for Leitchville-Gunbower in the Heathcote District Football League, Smartt played his Under-18 season with his local Talent League club, the Bendigo Pioneers. However, he did not get drafted by any AFL clubs in his first draft-eligible year.
Smartt joined Essendon's reserves team for the 2024 VFL season, while playing his local footy for the Keilor Football Club in the Essendon District Football League (EDFL) when he wasn't selected for the VFL team. He played 12 VFL matches for Essendon in 2024, and re-signed with the club for the 2025 VFL season, while moving to the Colac Football Club in the Geelong Football League.
Having impressed the club's recruitment team with his performances in the VFL, Smartt was drafted by Essendon in the 2025 mid-season rookie draft. Smartt continued to play in the VFL for Essendon until he was called up to make his senior debut in the AFL in round 18 against Richmond at the Melbourne Cricket Ground.