William Oloonkishu Yiampoy (born 17 May 1974, in Emarti) is a Kenyan runner who specializes in the 800 metres.
His personal best is 1:42.91 minutes, achieved in September 2002 in Rieti.
[1] He graduated from Sosio High School in Kilgoris in 1989.
[citation needed] He was part of the 4 x 800 metres relay team who currently holds the world record.
This Kenyan biographical article relating to athletics is a stub.