Kethi Diana Kilonzo (born 21 February 1977) is a Kenyan lawyer, lecturer and accountant. She is the daughter of the late Makueni senator Mutula Kilonzo and is most notable for her performance as the head council for AFRICOG's (Africa Centre for Open Governance) petition against the declaration of Uhuru Kenyatta as the president of Kenya. Kethi Diana Kilonzo argued against the results announced by the IEBC chairman Isaack Hassan citing the results as not credible.