Udo Quellmalz (born 8 March 1967 in Leipzig), known as Quelle, is a German judoka.[1] He competed in judo at the Summer Olympics, winning a bronze medal in 1992 and a gold medal in 1996.[2] He also won the World Judo Championships in 1991 and 1995.[3] Quellmalz was appointed head coach of the Flemish Judo Federation in 2022.[2] He has previously directed the British judo team and served as a coach for the Austrian and Qatari teams.[3]