Bon-e Kuh (, also Romanized as Bon-e Kà «h, Bonkà «h, and Bun-i-Kà «h; also known as Boneh Kà «h) is a village in Lajran Rural District, in the Central District of Garmsar County, Semnan Province, Iran. At the 2006 census, its population was 20, in 7 families.