Claes Einar Westerberg (28 October 1893 – 8 December 1976) was a Swedish physician.

[2] Westerberg received a Licentiate of Medical Science degree in Stockholm in 1919 and had various appointments as assistant physician between 1916 and 1922.

[2] Westerberg was appointed naval surgeon of the 1st class in the Naval Medical Officers' Corps in 1920, and served as assistant doctor in Vaxholm Coastal Artillery Regiment (KA 1) from 1920 to 1929, as acting battalion doctor in Vaxholm Grenadier Regiment (I 26) from 1922 to 1926, acting regimental physician from 1926 to 1927, physician in Göta Life Guards (I 2) from 1928 to 1931.

[2] He was also the Swedish government's representative at the congress in Stockholm in 1948, member and vice-chairman of the National Swedish Research Committee on Aviation and Naval Medicine (Flyg- och navalmedicinska nämnden) from 1946 to 1953, and chairman of the Scandinavian Association for Aviation Medicine (Skandinavisk förening för flygmedicin) from 1952 to 1954.

[1] Westerberg was a member of the Statistical Table Commission (Statistiska tabellkommissionen) from 1932.