Robert Mbui is a Kenyan politician, and first term member of the National Assembly representing Kathiani Constituency in Kenya. He is the fifth member of parliament to represent the constituency since its inception in 1988. He holds a Masters in Strategic Management from the Kenya Institute of Management.
Robert Mbui belongs to the Wiper Democratic Movement and is currently the party's organising secretary. The Kathiani MP is married to Janet Mbui the director of the Mutungoni Academy school located in Athi River. Together they have two sons and a daughter; Carlton, Shawn and Lakita