Arnfels is a municipality in the district of Leibnitz, in the Austrian state of Styria. It lies in the southern part of Styria, a region known as the Steiermark, within the Leibnitz administrative district.
As a municipality, Arnfels is one of the smaller administrative units of the Leibnitz district, which is situated in southern Styria near the border with Slovenia. The area around Leibnitz is traditionally associated with wine growing and agriculture, though Arnfels itself is a small, quiet settlement rather than a major urban centre.
Arnfels is not to be confused with other places of similar name. Its identity is tied to its status as a Styrian municipality within the Leibnitz district, and it forms part of the broader cultural and administrative landscape of southern Austria.