Sundelin is a Swedish surname that may refer to: Jörgen Sundelin (born 1945), Swedish Olympic sailor Matti Sundelin (1934–2025), Finnish football player Peter Sundelin (born 1947), Swedish Olympic sailor, brother of Ulf and Peter Stefan Sundelin (1936–2003), Swedish Olympic sailor, cousin of Jörgen, Peter and Ulf Ulf Sundelin (born 1943), Swedish Olympic sailor, brother of Jörgen and Peter