Nikolai Novosjolov (born 9 June 1980) is an Estonian fencer, a two-time world champion and world silver medalist in men's épée, winning gold at the 2010 World Championships in Paris and the 2013 World Championships in Budapest, and winning the silver at the 2017 World Championships in Leipzig .
He won the 2011–12 Fencing World Cup.
He was also a member of the Estonia team that won the silver medal in men's team épée at the 2001 World Championships in Nîmes.