| Type: | Stadt |
| Image Coa: | Wappen von Barntrup.svg |
| Coordinates: | 51.9831°N 9.1167°W |
| Image Plan: | Barntrup in LIP.svg |
| State: | North Rhine-Westphalia |
| Region: | Detmold |
| District: | Lippe |
| Elevation: | 203 |
| Area: | 59.46 |
| Postal Code: | 32683 |
| Area Code: | 05263, 05262 (Alverdissen) |
| Licence: | LIP |
| Gemeindeschlüssel: | 05 7 66 012 |
| Divisions: | 5 |
| Mayor: | Borris Ortmeier[1] |
| Leader Term: | 2020 - 25 |
| Party: | independent |
Barntrup (pronounced as /de/) is a town in the Lippe district of North Rhine-Westphalia, Germany. It has an area of 59.46 km2 and 8,501 inhabitants (2019).It lies 40 km east from Bielefeld and 9 km west from Bad Pyrmont at the east border of NRW to Lower Saxony.
Barntrup and Alverdissen were founded by the Earl of Sternberg in the year 1220. Originally Barntrup was called Barendorf and was a village at the Schratweg. Between 1317 and 1359 Barntrup was built on the highest point of the "Thornesberg" which is 189 m high above sea level. This is the central point of Barntrup.
Kerssenbrock Castle (also called Schloss Kerssenbrock or Barntrup Castle, see picture) was constructed from 1584-1588 by Anna von Kerssenbrock (maiden name Anna von Canstein). Her husband, Franz von Kerssenbrock, had been a mercenary in the French Wars of Religion, where he had made much money. The Kerssenbrock family was one of the main noble families in the region. It is still today owned by the von Kerssenbrock-Krosigk family.
The power transmission and industrial automation company KEB Automation KG is located in Barntrup.