Extertal is a municipality in the Lippe district of North Rhine-Westphalia, Germany, with c. 11,500 inhabitants (2013).

Extertal is located on the northern edge of the circle in the Teutoburg Nature Reserve, directly adjacent to Lower Saxony.

Neighbouring cities are Rinteln, Aerzen, Barntrup, Dörentrup and Kalletal.

The highest point of the city is at 371 metres above sea level.

Elected in September 2020, the mayor of Extertal is Frank Meier.