Samnanger is a municipality in the county of Hordaland, Norway. Samnanger was separated from Os on 1 January 1907. The municipality is located east of Bergen. Development of hydroelectric power plants started here in 1909.
The coat-of-arms is from modern times. They were granted on 27 April 1990. It shows six yellow drops of water on a red field. Water was chosen as a symbol on the arms because of the wet climate and the source of hydroelectricity that is prevalent in the area. The designer of the arms was Even Jarl Skoglund.