Krottendorf is a former municipality in the district of Weiz, in the Austrian state of Styria. It lies in the eastern part of Styria, within the district centred on the town of Weiz.
Since the 2015 Styria municipal structural reform, Krottendorf is no longer an independent municipality and has been part of the municipality of Weiz. The reform merged a number of small municipalities across Styria into larger administrative units.