Eastern Slavonia is the eastern area of Slavonia, northern Croatia.

Parts of eastern Slavonia adjacent to Serbia and Montenegro became internationally known after they were seized by ethnic Serbs soon after Croatia declared independence from Yugoslavia in 1991. The rogue state was referred to as Serbian Autonomous Region of Slavonia, Baranja and Western Sirmium, and it encompassed all of Baranja (Croatian part of wider Baranya region), plus roughly everything east of Osijek and Vinkovci and northeast of Županja, including the cities of Vukovar and Ilok.

It was turned over to UNTAES in 1996 after the Dayton Peace Accords were signed in 1995; Croatia took it under control in 1998.