| Intro | Kenyan distance runner |
| Is | Athlete |
| From | Kenya |
| Type | Sports |
| Gender | male |
| Birth | 22 February 1969 |
| Age: | 51 years |
William Kemei (22 February 1969 – 20 December 2007) is a former Kenyan middle distance runner who won the 1500 metres race at the 1991 All-Africa Games. In 1992 he set Kenyan records for 1500 m and one mile.
His greatest achievement was the victory in the Mile race at the ISTAF meeting in Berlin 1992 where he defeated the 1500 m world champion Noureddine Morceli who after that race remained undefeated until 1996. Kemei finished that race in 3:48.80 min, Morceli clocked 3:49.79. His time was a Kenyan record.He died on 20 December 2007 at his home in Mogoon, Nandi County.