Nathanael Christian Prosser (born May 7, 1986) is an American former ice hockey defenseman who played in the National Hockey League (NHL) from 2010 to 2022. He played for the Minnesota Wild, St. Louis Blues, and Philadelphia Flyers.
Growing up in Elk River, Minnesota, Prosser attended Elk River High School where he was a two-time All Conference selection and played in two State Tournaments. He experienced a growth spurt in his junior year and left Elk River as a senior to begin playing for the Sioux Falls Stampede of the United States Hockey League (USHL). He subsequently earned a full ride to play for the Colorado College Tigers for four years before signing an entry-level contract with the Minnesota Wild.