Calum Stewart Agius (born 5 September 2005) is a Welsh professional footballer who plays as a midfielder for club Crewe Alexandra. He is a Wales under-21 international.
Having joined the club aged seven, Agius come through the Crewe Alexandra academy system, and made his debut for the club on his 18th birthday as a scholar in their EFL Trophy game against Port Vale at Vale Park on 5 September 2023, coming on as a 61st minute substitute for Joe White, and being praised for his performance by Crewe manager Lee Bell. On 14 September 2023, he signed his first professional contract with the club, agreeing a three-year deal with the option of two additional years. Agius scored his first Crewe goal in a 1âÂÂ0 defeat of Harrogate Town in an EFL Trophy group stage game on 8 October 2024.
On 22 November 2024, Agius joined National League North side Marine on loan until 2 January 2025. He made eight appearances, scoring once. Returning to Crewe, he scored his first league goal in the side's 3âÂÂ2 defeat by Cheltenham Town on 10 April 2025.
Agius was called up to the Wales under-19s squad for June 2023 friendlies against Sweden and played in both games, a 1âÂÂ0 defeat on 15 June and a 2âÂÂ2 draw on 18 June 2023. On 20 March 2025, Agius played in Wales under-21s' 1âÂÂ0 victory over Andorra. In October 2025, Agius was again called up to the Under-21 squad, for European qualifiers against Belgium and Austria on 10 and 14 October respectively, playing in Wales' 2âÂÂ0 victory over Austria.