Oberrettenbach is a former municipality in the district of Weiz, in the Austrian state of Styria. It is located in the eastern part of Styria, within the Weiz district, which forms part of the larger region of Eastern Styria.
Since the 2015 Styria municipal structural reform, Oberrettenbach is no longer an independent municipality. It is now part of the municipality of Gersdorf an der Feistritz.