Daniel Matthew Mustapic (born 23 August 1960) is a New Zealand curler from Dunedin. He is a two-time (, ) and a four-time New Zealand men's champion (2003, 2005, 2006, 2012).
He participated in the 2006 Winter Olympics, where the New Zealand men's team finished in tenth place.
Prior to emigrating to New Zealand, Mustapic was active in the Ontario curling scene. While living in Hamilton and curling out of Kitchener, he won the 1994 Welton Beauchamp Classic. He is the father of comedian James Mustapic.