Sigvard Arne Eklund (19 June 1911 – 30 January 2000) was Director General of the International Atomic Energy Agency from 1961 to 1981.

[1] Eklund worked as a docent in nuclear physics at the Royal Institute of Technology in Stockholm and as an employee of the Royal Swedish Academy of Sciences Institute of Physics (Vetenskapsakademiens forskningsinstitut för fysik) from 1937 to 1945.

[1] Eklund became director of research at the Swedish Atomic Energy Company (AB Atomenergi, Stockholm) in 1950.

[3] In 1957, he was Secretary General for the Second International United Nations Conference on the Peaceful Uses of Atomic Energy.

Eklund was reappointed four more times in 1965, 1969, 1974 and 1977, holding the post for twenty consecutive years until he retired and was named Director General Emeritus.