Sebastian Fleischer (born 26 December 1993 in Helsingør) is a Danish windsurfer, who specialized in Neil Pryde RS:X class.

8 in the world for the sailboard class by the International Sailing Federation.

Fleischer competed in the men's RS:X class at the 2012 Summer Olympics in London by receiving a berth from the World Championships in Cádiz, Spain.

[3][4] Struggling to attain a top position in the opening series, Fleischer accumulated a net score of 220 for a twenty-ninth-place finish in a fleet of thirty-eight windsurfers.

This biographical article related to Danish sports is a stub.