Bastos is a municipality in the state of São Paulo, Brazil. It covers an area of 172 km² and has a population of 20,953.
The city is located in the western interior of São Paulo state, a region of Brazil characterized by agricultural activity and a network of small and mid-sized municipalities. Like many towns in this part of the state, Bastos functions as a local administrative and service center for its surrounding area.
Its relatively small land area and modest population make it one of the many municipalities that together form the densely settled interior of São Paulo, Brazil's most populous state.