The County of Ravensberg was a historical county of the Holy Roman Empire. Its territory was in the region of Westphalia.
Ravensberg was first mentioned in the 12th century; its first capital was Burg Ravensberg. The Counts of Ravensberg then had Sparrenberg Castle built in Bielefeld ca. 1240–50, which they made their seat.
The county was later inherited by the Duchy of Berg in 1346, which in turn became part of the Duchy of Jülich-Berg in 1423, and ultimately the United Duchies of Jülich-Cleves-Berg in 1521.
After the War of the Jülich succession, in the Treaty of Xanten in 1614, the County of Ravensberg came to the Maragrivate of Brandenburg, which became the Kingdom of Prussia in 1701, and was administered within Minden-Ravensberg from 1719–1807, when it was dissolved during the Napoleonic Wars.