Ostrów Wielkopolski County () is a unit of territorial administration and local government (powiat) in Greater Poland Voivodeship, west-central Poland. It came into being on January 1, 1999, as a result of the Polish local government reforms passed in 1998.
Ostrów Wielkopolski County () is a local administrative division within Greater Poland Voivodeship, Poland. It was established on January 1, 1999, following changes to the Polish local government system enacted in 1998.