Infrared thermography has been investigated as a non destructive testing method for health monitoring of rotating mining mills. The idea is to monitor the thermal differences on the mill surface with thermal camera in order to detect and maintain cracks and other material damage in the mill material. A general description of the thermography technique, the theory behind, advantages and drawbacks as well as its use in other applications is presented. To test the usefulness of the method, real life measurements with IR-camera have been performed on several mining mills at a mining company located in northern Sweden. The results from these measurements are presented and discussed in this article. Infrared thermography is a fast and relatively cheap inspection method which can find and monitor material damage in rotating mining mills and help the maintenance personal in taking the corrective maintenance decisions.