Joel William Colwill (born 27 October 2004) is a Welsh professional footballer who plays as an attacking midfielder for EFL League One club Cardiff City and the Wales national team.

Colwill is a product of the Cardiff City academy, signing his first professional contract with Cardiff in June 2022. In August 2023, Colwill made his senior debut for Cardiff City in the EFL Cup against Colchester United. Colwill signed a new five-year contract with Cardiff City in September 2023.

On 2 August 2024, Colwill joined League Two club Cheltenham Town on an initial season-long loan deal. Having impressed over the first-half of the season, it was announced on 10 January 2025 that Colwill would be recalled from his loan at Cheltenham. On 12 January 2025, Colwill was signed by League One club Exeter City on loan until the end of the season.

Joel Colwill made his Wales Under-21 debut on 8 September 2023 in the 4-0 friendly win against Liechtenstein alongside his brother Rubin. In September 2025 he was called up to the Wales senior squad for the first time.

He made his Wales senior debut in a 1-0 friendly defeat to Canada on 9 September 2025.

Joel Colwill is the younger brother of Wales international footballer and Cardiff City teammate Rubin Colwill.

Cheltenham Town Young Player of the Year (2024/25)