Harrison Patterson Ashcroft Matthias (born 25 June 2003) is an Australian cricketer. He plays for the South Australia cricket team as a wicketkeeper.
Matthias studied at Prince Alfred College. He made his debut for Sturt at the age of 15. Matthias made his first-class debut against Victoria in February 2023, replacing Harry Nielsen who was ill. He was selected in the Cricket Australia XI to play the West Indies in January 2024.