Gallspach is a municipality and spa in the district of Grieskirchen in the Austrian state of Upper Austria.

It comprises also the following villages: Enzendorf, Gferedt, Niederndorf, Schützendorf, Thall, Thongraben, Vornwald and Wies.

In the Roman era the forested tract of Gallspach belonged to the area of the Colonia Aurelia Antoniana Ovilabis/(Wels), which became the capital of the province of Noricum Ripensis in the 4th century.

In 1439 Gallspach was given the right to hold a regular market every week on wednesday by king Albert II of Germany, which was confirmed in 1442 by emperor Frederick III.

In September 1940 and two weeks before his solo flight to Scotland in 1941, Rudolf Hess, the Nazi Deputy Führer and later war criminal met there with Albrecht Haushofer, who probably encouraged him in his failed mission to negotiate peace with the United Kingdom.