Martin Gruber (born 11 November 1975 in Brixen) is an Italian luger who has competed since 1992. A natural track luger, he won the men's singles silver medal at the 1998 FIL World Luge Natural Track Championships in Rautavaara, Finland.
Gruber also won a silver medal in the same event at the 1995 FIL European Luge Natural Track Championships in Kandalaksha, Russia.