Peter Regin (born April 16, 1986) is a professional ice hockey player with the Ottawa Senators of the National Hockey League (NHL). He was drafted by Ottawa in the third round (87th overall) of the 2004 NHL Entry Draft. After playing several professional seasons in Europe, he moved to North America in 2008 to join the Senators organization.

Regin played for the Herning Blue Fox of the Danish Elite League from 2002 to 2005. In 2004, he was drafted by the NHL's Ottawa Senators using the third-round draft pick of the Colorado Avalanche, received in a trade for Shane Hnidy with the Nashville Predators. He played one more season with Herning. In 2005, he joined Timrå IK in the Swedish Elitserien league. He played three seasons for Timrå, increasing his goal and point production in each season.

In 2008, Regin signed an NHL entry-level contract with the Senators. He was assigned to the Senators' minor league affiliate, the Binghamton Senators for the 2008–09 season. Due to injuries in Ottawa, he was called up and made his NHL debut on January 20, 2009 in a game against the Washington Capitals. He was returned to Binghamton one day later, registering no points in his NHL debut. Following the NHL All-Star break, he was recalled by Ottawa and scored his first NHL goal, the game winner, in his third NHL game on January 29 against Chris Mason and the St. Louis Blues.