Nayef bin Mamdouh Al Saud (; born 1971) is a member of the Saudi royal family, one of the grandsons of Saudi Arabia's founder King Abdulaziz.
Nayef is the son of Mamdouh bin Abdulaziz, former governor of Tabuk Province. He received his bachelor's degree in Islamic Studies from King Abdul Aziz University in Jeddah, and a master's degree in Islamic theology at the Islamic University of Madinah.
Nayef is known for his inventions, which include a rescue and relief helicopter with a massive firefighting unit, for which he received a grand prize at the International Federation for Inventors (IFIA), Geneva International Exhibition of Inventions.
Prince Nayef is married and has five children: