THEODORE M. OSBORNE, 86, a retired Army brigadier general and a past executive vice president of the old West Brothers Brick Co., died June 24 of complications of diabetes and cancer at a nursing home in Greenwich, Conn., where he had lived since 1985.

During World War II, Gen. Osborne was the chief engineer and later the commanding general of the Persian Gulf district of the Army Corps of Engineers. He served in Iran from 1942 to 1944. He was a special assistant to the under secretary of war in Washington before retiring in 1947.

For the next six years, he was the manager of the chemical and gas department of Koppers Co. Inc. in Pittsburgh. He returned to Washington in 1954 and joined the West firm, from which he retired in 1965. He moved to Connecticut last year.

Gen. Osborne was born in Teton, Mont. He graduated from the U.S. Military Academy at West Point in 1923 and earned a degree in civil engineering from Cornell University in 1925.

His military decorations included two Distinguished Service Medals. He was a member of the Association of Graduates of the U.S. Military Academy.

His wife, Evelyn West Osborne, died in 1965. Survivors include two daughters, Elizabeth Claudy of Greenwich and Dorothy Hinkley of Paoli, Pa.; one brother, Nathan, of Spokane, Wash.; five grandchildren, and four great-grandchildren.