 As a commune, Olivar is a third-level administrative division of Chile administered by a municipal council, headed by an "alcalde" (mayor) who is directly elected every four years.The 2012-2016 mayor is Maria Estrella Montero Carrasco.Within the electoral divisions of Chile, Olivar is represented in the Chamber of Deputies by Ricardo Rincón (PDC) and Felipe Letelier (PPD) as part of the 33rd electoral district, (together with Mostazal, Graneros, Codegua, Machalí, Requínoa, Rengo, Doñihue, Coinco, Coltauco, Quinta de Tilcoco and Malloa).