Pieter Kollen (May 27, 1939—August 5, 2007) was an American figure skater and coach.
They placed 8th in pairs and 7th in dance at the 1962 World Figure Skating Championships.
The following season, following Nelson's retirement from competitive skating, Kollen competed in pairs with new partner Patti Gustafson.
They were the first pair team to perform the throw axel, which was invented by their coach Ronald Ludington.
[1] For many years following his own competitive career, Kollen was a coach at the Indiana/World Skating Academy in Indianapolis, Indiana.