The magnitude and frequency of debris flow (DF) are projected to increase globally and more so in the mountain regions. This is a result of increased precipitation which is associated with climate change. While rare, DFs severely impact critical infrastructure (CI) and society when they occur. Despite this, DFs are understudied in Sweden. This thesis aimed to bridge this knowledge gap by mapping DF risk in Jämtland County, Sweden. This was achieved using weighted overlay analysis to determine the susceptibility of the study area to DF hazards. Five DF susceptibility parameters were chosen (slope angle, aspect, soil type, land cover, and channel distance), reclassified on a scale of 1 to 5 (where 1 represented the lowest DF susceptibility and 5, the highest susceptibility), and then equal weights applied to produce the DF hazard output. The results show that Jämtland County has a Medium to High susceptibility to DF hazards. Particularly, the villages (or small towns) in the western parts of the county (Bakvattnet, Kallsedet, Åre, Duved, Undersåker, and Storlien) and the north (Ankarvattnet, Viken, Gäddede, and Valsjöbyn) are more susceptible to DF hazards. Besides, a DF hazard intersection with CI was carried out, indicating that about 57% of CI is located within the Medium DF hazard areas. In comparison, 32% is found within the High DF hazard areas.