Lydiah Tum Chepkurui (born 23 August 1984) is a Kenyan track and field athlete who competes in the 3000 metres steeplechase.

[1] She was one of three Kenyan entrants in the heptathlon at the 2010 African Championships in Athletics and, although her run of 2:15.40 minutes in the final 800 m event was easily the best in the field, she finished last with a total of 3676 points as she performed to a poor international standard in the other events (including 20.76 seconds for the 100 metres hurdles and 6.83 m for the shot put).

She reduced her best time to 9:30.73 minutes over the course of the season, finished fifth at the London Grand Prix and placed fourth at the 2011 All-Africa Games.

She did not reach the Olympics the following year, ending up sixth at the Kenyan Trials, but performed well on the 2012 IAAF Diamond League circuit.

She ran a personal best of 9:13.75 minutes and defeated a field including Olympic medallists such as Habiba Ghribi, Sofia Assefa and Milcah Chemos Cheywa.