Dennis Demmers (Deventer, 21 March 1975) is a Dutch football coach and former footballer. He is best known as a coach in amateur football. In 2010, when coaching both Excelsior '31 (Saturday) and Colmschate '33 (Sunday) he received the Rinus Michels Award.
In professional soccer, he was an assistant manager, scout and manager (2015–2016) of Go Ahead Eagles. He went on to become assistant coach and video analyst of Al-Taawoun FC in Saudi Arabia. Coach Darije Kalezić fired Demmer after five games.