Nadeau may refer to:
- People
- Jerry Nadeau (born 1970), American race car driver
- Remi Nadeau (born 1920), American historian
- Richard Nadeau (born 1959), Canadian teacher and Bloc Québécois politician in Quebec
- Robert Nadeau (aikido teacher) (born 1937), American aikido teacher
- Robert Nadeau (science historian), American environmental scientist and science historian
- Places
- Nadeau, California, USA
- Nadeau Township, Michigan, USA