Gressenberg is an area of western Styria, Austria. Until 2014, Gressenberg was a municipality in the district of Deutschlandsberg in the Austrian state of Styria. Since the 2015 Styria municipal structural reform, it is part of the municipality Schwanberg.

Historical population

Year	Pop.	±%
1869	745	—
1880	710	−4.7%
1890	659	−7.2%
1900	626	−5.0%
1910	605	−3.4%
1923	603	−0.3%
1934	701	+16.3%
1939	680	−3.0%
1951	621	−8.7%
1961	561	−9.7%
1971	489	−12.8%
1981	405	−17.2%
1991	379	−6.4%
2001	352	−7.1%
2011	318	−9.7%
2014	283	−11.0%