Denner is a surname. Notable people with the surname include:
Balthasar Denner (1685–1749), German painter
Charles Denner, French actor
Jacob Denner, woodwind instrument maker, son of Johann Christoph Denner
Johann Christoph Denner, (1655-1707), famous woodwind instrument maker
Michael Denner, Danish heavy metal guitarist
Pat Denner, American neon sign designer