This article is about a city in Japan formerly named Sayama. For the city currently known as Sayama, see Sayama, Saitama
Ōsakasayama (大阪狭山市 Ōsakasayama-shi) is a city in Osaka Prefecture, Japan. The city was founded on October 1, 1987, after the town of Sayama was reorganized into the city of Ōsakasayama.
As of 2010, the city has an estimated population of 58,172 and a population density of 4,900 persons per km². The total area is 11.86 km².
A campus of Tezukayama Gakuin University is located in the city.