| Conventional Long Name: | County of Ravensberg |
| Common Name: | Ravensberg |
| Era: | Middle Ages |
| Status: | County |
| Empire: | Holy Roman Empire |
| Government Type: | Principality |
| Year Start: | 1140 |
| Year End: | 1810 |
| Event Start: | Otto I, Count of Ravensberg |
| Event1: | Gerhard I, Count of Berg and Ravensberg |
| Date Event1: | 1338 |
| Event2: | Joined Westphalian Imperial Circle |
| Date Event2: | 1500 |
| Event3: | John III, Duke of Jülich-Cleves-Berg |
| Date Event3: | 1521 |
| Event4: | To Brandenburg-Prussia by Treaty of Xanten |
| Date Event4: | 1614 |
| P1: | County of Calvelage |
| S1: | Minden-Ravensberg |
| Image Map Caption: | Contemporary map from the 17th century |
| Image Map2: | Minden-Ravensberg-Juli 1806 pol.png |
| Image Map2 Caption: | Minden-Ravensberg in 1806 |
| Capital: | Bielefeld |
| Today: | Germany |
The County of Ravensberg (German: Grafschaft Ravensberg) was a historical county of the Holy Roman Empire. Its territory was in present-day eastern Westphalia, Germany, at the foot of the Osning or Teutoburg Forest.
Ravensberg was first mentioned in the 12th century; its first seat was Ravensberg Castle. The Counts of Ravensberg then had Sparrenberg Castle built in Bielefeld, which they made their seat. They also owned Limberg Castle near German: [[Preußisch Oldendorf]].
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 Margraviate 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.
Aside from Bielefeld, other communities in the County of Ravensberg were Borgholzhausen, Halle, Steinhagen, Versmold, Werther, Isselhorst (now part of Gütersloh), Enger, Hiddenhausen, Rödinghausen, Spenge, Herford (except for Falkendiek), Bünde (except for Dünne and Spradow), Vlotho (except for Uffeln), Kirchlengern south of the Werre, Preußisch Oldendorf (except for Hedem and Lashorst) and Bad Oeynhausen south of the Werre.
1348–1395 in Personal union with Berg, since 1437 with Jülich-Berg
from 1521 a part of the United Duchies of Jülich-Cleves-Berg
from 1614 Margraves of Brandenburg and Kings of Prussia
To France by the 1807 Treaty of Tilsit, incorporated into the Kingdom of Westphalia