The constituency was established for the 1988 elections when the Kandara Constituency was split into two. Gatanga Constituency consists of Gatanga and Kakuzi administrative divisions, the latter was added in 2002.
Members of Parliament
|1988||Joseph Mwaura Gachui||KANU||One-party system|
|1992||Josephat Mburu Wanyoike||Ford-Asili|
|1997||David Wakairu Murathe||SDP|
|2013||Humphrey Kimani Njuguna||NARC|}