Dahisar (Marathi: दहिसर) is a suburb of Mumbai. It is also the name of a railway station on the Mumbai suburban railway on the Western Railway (India) railway line, situated in Dahisar suburb. Located on the city limits of Mumbai, Dahisar is the last suburb and railway station within the Mumbai Suburban District; past Dahisar lie the city's extended suburbs.

There is a record of continuous habitation since 1630s, as per Parish records of Our Lady of the Immaculate Conception Church

The original residents of Dahisar are the Panchkalshis, Agris, East Indians and Kolis, who still live primarily in the hamlets of Kandarpada and Gaothan and the tribes who lived in the hills surrounding Dahisar - the Warlis and Dublis.

With the construction of the railway line connecting Dahisar to the city of Mumbai in 1867, came the first lot of migrants, the people from Sindhudurg region of Konkan. These migrants established the first planned residential areas of Dahisar - Maratha Colony in Dahisar East and Mhatre Wadi in the West. The Railway authorities wanted to name the Railhead at Dahisar as Mount Poinsur, but the locals opposed this move and forced the authorities to name it as Dahisar.