Mats Jürgen Grambusch (born 4 November 1992) is a German field hockey player who plays as a midfielder or forward for Bundesliga club Gladbacher HTC and the Germany national team.
He was educated at Seaford College.
Grambusch has played for the national team since 2011. He represented his country at the 2016 Summer Olympics, where he won the bronze medal. After the 2024 Summer Olympics, he returned to his boyhood club Gladbacher HTC.