Gregory Dean "Greg" Classen (born August 24, 1977) is a German-Canadian former professional ice hockey centre.

Classen played a total of 90 games in the National Hockey League (NHL) all with the Nashville Predators.

After his career in North America, he moved to Europe and retired after the 2018–19 season in the German Eishockey-Oberliga with the Rostock Piranhas.

[1][2] After going undrafted, Classen signed as a free agent in 1999 with the National Hockey League (NHL) team Nashville Predators.

[8] On July 18, 2010, Classen returned to the German DEL and signed a two-year contract with Kölner Haie.

[13] Classen left the Füchse squad upon the conclusion of the 2015-16 campaign and was signed by fellow DEL2 side Starbulls Rosenheim on August 27, 2016.

[14] Classen moved on to a Player-Assistant Coach role for two seasons (2017–18 and 2018–19) with the Rostocker EC Piranhas of the German Eishockey-Oberliga.

Classen's parents Gord and Marjorie were killed by an impaired driver in a head-on collision on Saskatchewan Highway 41 between Saskatoon and Aberdeen on January 23, 2020.