Dechantskirchen is a municipality in the district of Hartberg-Fürstenfeld in Styria, Austria.

The municipality resides approximately 15 km north of the district capital Hartberg.

The highest place of the municipality territory is the Hochkogel (1.314 m), the moust southern one thousand mountain of the Wechsel.

The municipality is composed of three Katastralgemeinden Dechantskirchen, Hohenau, Kroisbach und Schlag respectively of eight small towns (population 1.

Because of many archeological evidences,[citation needed] there is reason to expect that human settlement existed already in prehistoric time, like 3000 to 1500 before Christ, at the arey of Dechanstkirchen.