Mac Hollowell (born September 26, 1998) is a Canadian professional ice hockey defenceman. He is currently playing for the Toronto Marlies in the American Hockey League (AHL) while under contract with the Toronto Maple Leafs of the National Hockey League (NHL). In 2019, he was named to the Ontario Hockey League First All Star Team.
On October 6, 2019, Hollowell recorded his first career ECHL goal in an overtime win against the Reading Royals. He made his AHL regular season debut in an 8–5 win over the Texas Stars on November 16, 2019. However, on November 24 he was reassigned to the ECHL.