John Nada Saya (8 August 1978 – December 2011) is a Tanzanian long-distance runner. He was born in Arusha. He finished fifteenth in the short race at the 2000 World Cross Country Championships. He competed in the marathon race at the 2004 Summer Olympics, but did not finish. He also won the 2001 Milan Marathon, setting a personal best of 2:08:57 hours.