Michael McDonald (born 24 June 1999) is an Irish Australian rugby union player who has played for the Waratahs and Western Force in Super Rugby, and Ulster and Connacht in the URC. His playing position is scrum-half.
He signed to the professional team, the New South Wales Waratahs, in the Super Rugby, for the 2020 season. He joined Ulster in July 2022. He was selected for the Emerging Ireland squad for the Toyota Challenge in South Africa in September 2022. The following season he moved to Connacht on a season-long loan. He returned to Ulster ahead of the 2024-25 season, before signing for the Waratahs as short-term injury cover in March 2025. He left Ulster at the end of the 2024-25 season. He was released by the Waratahs at the end of the 2026 season.