East Java (Indonesian: Jawa Timur, Javanese: Jawa Wétan) is a province of Indonesia. It is located on the eastern part of the island of Java and includes neighboring Madura and islands to its east (the Kangean and Sapudi groups) and to its north (Bawean and the Masalembu Islands. The provincial capital is Surabaya, the second largest city in Indonesia and a major industrial center and port.

According to the 2000 census, East Java has 34 million inhabitants, estimated to increase to 37½ million in 2010, making it the second most populous Indonesian province after West Java. The inhabitants are predominantly ethnically Javanese. Native minorities include migrants from nearby Madura, and distinct Javanese ethnicities such as the Tengger people in Bromo, the Samin and the Osing people in Banyuwangi. East Java also hosts a significant population of other ethnic groups, such as Chinese, Indians, and Arabs. In addition to the national language, Indonesian, they also speak Javanese. Javanese as spoken in the western East Java is a similar dialect to the one spoken in nearby Central Java, with its hierarchy of high, medium, and low registers. In the eastern cities of Surabaya, Malang, and surrounding areas, a more egalitarian version of Javanese is spoken, with less regard for hierarchy and a richer vocabulary for vulgarity.