Mas Penewu Surakso Hargo, better known as Mbah Maridjan (Grandfather Maridjan) (5 February 1927? - 26 October 2010) was the spiritual guardian or gatekeeper of the Indonesian volcano Mount Merapi. His birthplace was in the mountainside hamlet (Javanese language-dukuh) of Kinahrejo, Umbulharjo Village, Cangkringan District, of the Sleman Regency, on the island of Java in Indonesia.