Major General Bernt Nils Sune Östh (born 20 December 1936) was a Swedish Air Force officer.
Östh attended the Stridsledningslinjen ("Combat Control Program")[4] at the Swedish Armed Forces Staff College from 1966 to 1968 and was promoted to captain in 1967.
He was then head of the Study and Research Coordination in the Central Planning Unit (Enheten för centralplanering) at the Defence Materiel Administration from 1980 to 1981 and from 1981 to 1984 he served as commanding officer of Flygvapnets Södertörnsskolor (F 18).
[3] On 1 April 1984, Östh was promoted to senior colonel and was appointed head of the Planning Section 3 (Planeringssektion 3) in the Defence Staff.
His assumed the position of Chief of the Joint Staff (Gemensamma staben) at the Swedish Armed Forces Headquarters on 1 July 1994.