Peter Marinus Nieuwenhuis (born 3 April 1951) is a Dutch retired cyclist who was active between 1970 and 1976. He competed at the 1976 Summer Olympics in the 4 km team pursuit and finished in fifth place. He won a bronze medal in this event at the 1973 World Championships.
His wife, Minie Brinkhoff, was also a top-level cyclist.