Callum Anthony Reilly (born 3 October 1993) is a professional footballer who plays as a midfielder for EFL League Two club Leyton Orient.
A midfielder who has also played at full back, Reilly began his career as a youngster with Birmingham City. He made his first-team debut in January 2012, turned professional later that year, and over the next three seasons made 66 appearances in all competitions. He had a short spell on loan at Burton Albion in 2015, and joined the club on a two-year contract in June of that year. Unable to establish himself in their first team, he spent the second half of the 2016–17 season on loan to Coventry City, and then joined Bury. After a loan spell at Gillingham, he signed for them ahead of the 2018–19 season. He was released in 2019 and spent the next two seasons with AFC Wimbledon in EFL League One.
He has represented the Republic of Ireland at under-21 level.