Raabau is a former municipality in the district of Südoststeiermark, in the Austrian state of Styria. It lies in the southeastern part of the country, within the region known as Styria.
Since the 2015 Styria municipal structural reform, Raabau has been part of the municipality of Feldbach rather than a separate administrative unit. The reform merged a number of small municipalities across Styria into larger ones.
As a result of that change, Raabau is no longer an independent municipality, and its administration is handled as part of Feldbach.