Irene Jerotich Kosgei[nb] (born 8 September 1974) is a Kenyan long-distance runner who specialises in the marathon.

[4] She was fourth at the Berlin Half Marathon in April, missing out on the podium spot to her compatriot Beatrice Omwanza.

[5] Jerotich entered the Nairobi Marathon for the first time in 2005 and she finished as runner-up with a new best of 2:37:52 behind Caroline Cheptanui Kilel.

In Nairobi she won her first marathon race, beating Chinese runner Zhang Xin and recording a lifetime best of 2:32:39.

[14] Jerotich continued her career high into 2010, beginning with a half marathon best of 1:11:17 at the City-Pier-City Loop, which brought her second place behind Pauline Wangui.

[18] She was picked for the Kenyan marathon squad at the 2011 World Championships in Athletics and came thirteenth in a time of 2:31:29 hours.