Trebesing is a municipality in the district of Spittal an der Drau, in the Austrian state of Carinthia. It lies in the southern part of the country, within a district that stretches across the mountainous terrain of western Carinthia.
As a small Carinthian community, Trebesing forms part of the rural settlement pattern typical of the Spittal an der Drau district, which is characterised by scattered villages and towns set among the Alps. The municipality is one of many local administrative units that make up the district.
Beyond its administrative status and location, few details are recorded in the available source material. Trebesing remains a minor municipality within the broader Carinthian landscape, and its identity is tied to the district and state to which it belongs.