Nicholas Sprenger (born May 14, 1985) is an Australian middle distance freestyle swimmer, who won a silver medal in the 4x200 m freestyle relay at the 2004 Athens Olympics.

Coming from Brisbane, Queensland, Sprenger who is coached by Michael Bohl spent the beginning of his career as the understudy of fellow Australians Ian Thorpe and Grant Hackett. After finishing third in the 200 m freestyle at the 2003 Australian Championships, Sprenger was selected to make his debut at the age of 18 at the 2003 FINA World Championships in Barcelona, Spain, where he was a part of the 4x200 m freestyle relay team which won gold ahead of the United States. The following year, he was again third behind Thorpe and Hackett, and was a part of the team alongside Thorpe, Hackett and Michael Klim which was defeated by the Americans in Athens in the 4x200 m freestyle relay, ending Australia's six-year reign in the event.

In 2005, with Thorpe taking a year off, Sprenger assumed the number 2 middle distance swimmer role behind Hackett. Despite being involved in a mild car accident in late May, and being prevented from performing the complete training repertoire until one week before the event, Sprenger went on to set gallant personal bests in both the 200 m and 400 m events at the 2005 FINA World Championships in Montreal, Canada in July, placing fifth in the 200 m event in a time of 1 min 47.09 s. He also collected a bronze medal as part of the 4x200 m freestyle relay.

In 2006, with Australian captain Hackett sidelined with by a shoulder operation, Sprenger appeared likely to have another opportunity to establish himself as a world-class swimmer. However, he was plagued by a virus and was unable to compete. His cousin Christian Sprenger is a breaststroke swimmer on the fringes of national selection.