Admiral Claës Fabian Tamm (13 November 1879 – 4 October 1955) was a Swedish Navy officer.

Tamm steadily advanced through the ranks, becoming a lieutenant commander in 1918 and head of the Royal Swedish Naval Academy in 1921.

He attended the Royal Swedish Naval Staff College from 1904 to 1906 and was promoted to lieutenant on 1 November 1907.

He was a member of the defence inquiry in 1928 and 1929, and served as flag captain in the Commander-in-Chief of the Coastal Fleet's staff from 1930 to 1931.

Promoted to rear admiral on 27 January 1933, he officially assumed the role in the navy on 15 April 1933 and, that same year, became Commander-in-Chief of the Coastal Fleet.

[5] On 4 January 1908 at Hargs bruk in Hargs socken [sv], he married Baroness Eva Ebba Gustava Beck-Friis (1884–1963), the daughter of Baron Joachim Beck-Friis [sv] och Baroness Anna van Otter.