Lieutenant General Karl Rudolf Kolmodin (17 January 1896 – 29 August 1978) was a Swedish Coastal Artillery officer.

[3] Kolmodin was commissioned as an officer in the Swedish Coastal Artillery in 1916 with the rank of second lieutenant.

[4][3] Kolmodin then served in the Artillery Department of the Royal Swedish Naval Materiel Administration from 1928 to 1935.

In 1942, Älvsborg Coastal Artillery Regiment (KA 4) in Gothenburg was raised and Kolmodin was promoted to colonel and became its first commander.

In 1953, Kolmodin was promoted to major general and appointed Inspector of the Swedish Coastal Artillery.