Onesimus Kipchumba Murkomen is a Kenyan lawyer and politician who has represented Elgeyo-Marakwet County as Senator across three election cycles, holding the seat in the 13th Parliament as a member of the United Democratic Alliance (UDA). An Advocate of the High Court of Kenya, he has moved between the Senate and the Cabinet, having served as Cabinet Secretary for Roads, Transport and Public Works, then as Cabinet Secretary for Youth Affairs, the Creative Economy and Sports, before his current appointment as Cabinet Secretary for Interior and National Administration. His career illustrates a close interplay between legislative representation of Elgeyo-Marakwet and senior executive responsibility in national government.