William Cheruiyot Sigei (born 11 October 1969 in Cheboi'ngong' village, just outside Kapsimotwo village, Bomet, Kenya) is a former Kenyan long-distance runner who won the IAAF World Cross Country Championships in 1993 and 1994. In 1994 he a set a new world record over 10,000 metres in Oslo with 26:52.23 minutes.
- William Sigei at World Athletics
- Okoth, Omulo (17 March 2007). "A Kenyan XC legend - William Sigei". IAAF. Retrieved 2007-03-19.
- "IAAF: 100 Metres - men - senior - outdoor - 2018 | iaaf.org". iaaf.org. Retrieved 2018-05-02.
| Men's 10,000 m world record holder
22 July 1994 – 5 June 1995
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