Reinder Aart Nummerdor (born 10 September 1976) is a Dutch volleyball player who represented his native country at five consecutive Summer Olympics.

[1] He earned a total number of 349 caps, and teamed up with Richard Schuil after the Athens Games for a career in beach volleyball.

On 12 May 2007 in Bahrain, the two won their first FIVB World Tour gold medal.

[2][3] They lost in the bronze medal match against Plavins and Smedins of Latvia.

Nummerdor is married to the Dutch volleyball player Manon Nummerdor-Flier.