George J. Thompson Jr., 62, an area resident for more than 25 years who was active in veterans organizations, died Monday at Bethesda Naval Hospital. He had, multiple sclerosis.

He was a member of the Navy Advisory Committee on Retired Personnel and in 1977 received a commendation for his work from the secretary of the Navy.

A resident of Kensington, Mr. Thompson was a charter member and past commander of the Montgomery County Chapter of the Retired Officers Association. He had been commander of Chapter 10 of the Disabled American Veterans.

At the time of his death, he was adjutant of the Bethesda chapter of the Military Order of the World Wars and commander of Connecticut Avenue Post No. 163 of the American Legion.

Mr. Thompson was a native of Waltham, Mass., and had attended Cornell University. He enlisted in the Navy in 1944 and served in Europe and the Mediterranean during World War II. He was stationed at the Naval Training Center in Bainbridge, Md., in 1953, when it was discovered that he had multiple sclerosis and he received a medical discharge.

His marriage to the former Frances Woodruff ended in divorce.

Mr. Thompson's survivors include his wife, Mary Dolan Thompson of Kensington; a son and a daughter by his first marriage, Dr. George J. III of Emporia, Kan., and Carole Wren of Novato, Calif.; his mother, Ruth B. Thompson of Ithaca, N.Y.; a brother, Leonard C. of Kansas City, Mo., and five grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Bethesda-Chevy Chase Rescue Squad, Bethesda, Md.