The KSOG-Mombasa was formerly the Government Training Institute (G.T.I.) Mombasa, one of the training institutions under the Ministry of State for Public Service, in the Office of the Prime Minister.
The Institute was established as Coast Secretarial College in 1964 as a Pre-Service Secretarial College. It was upgraded to Government Secretarial College in 1972 to provide secretarial skills training to clients nationally. In 1978, the Institute was upgraded and renamed the Government Training Institute, and mandated to provide management development training for Public Sector Organizations. On 1st July 2012, Government Training Institutes Mombasa, Embu, Matuga, Baringo and Kenya Institute of Administration, became campuses of Kenya School of Government through an Act of Parliament.
Overtime, the school has diversified its objectives not only to offer in-service training but also conduct Research and offer Consultancy services to the public sector. The Institute has progressively contributed towards performance enhancement and service delivery in the public sector.
In order to assure quality in service delivery the Campus embarked on a certification process that culminated in being ISO 9001:2008 certified with effect from 29th June 2012.