Retired Navy Capt. Richard F. J. Johnson Jr., 75, who helped establish the military structure of the North Alantic Treaty Organization, died yesterday at the Bethesda Naval Hospital.

From 1950 until he retired in 1954, he served as a senior U.S. planner of a group of officers fromed to organize and establish the NATO military structure. He was based in Washington and traveled to France, England, Italy, Greece and Turkey.

Born in Greensboro, N.C., Capt. Johnson graduated from the U.S. Naval Academy at Annapolis in 1924. He later took postgraduate work in engineering at the University of California.

Much of his career at sea was spent in destroyer duty. In 1940 he was assigned as chief engineer of the heavy cruiser, the U.S.-S. Portland, and then became repair and maintenance officer on the staff of the commander of Pacific Fleet destroyers.

Capt. Johnson was on duty in Pearl Harbor when it was attacked by the Japanese. He participated in the major repair program following the attack.

In 1943 he was assigned to the Navy Bureau of Personnel in Washington. He returned to the Pacific in 1945 as commander of a destroyer squadron.

After World War II, Capt. Johnson returned to the Bureau of Personnel. He later was a member of the Strategic Plans Division in the Office of the Chief of Naval Operations here. He attended the National War College in 1949-50.

His decorations included the Bronze Star.

After retirement, Capt. Johnson remained in the Washington area. He was a consultant in planning and development for the District of Columbia for a number of years.

He was a member of St. Albans Episcopal Church, the Army and Navy Club and the Jamestown Society.

He is survived by his wife, Thelma Riggs Johnson, of the home in Alexandria; two stepdaughters, Ann T. Miller, of Doylestown, Pa., and Isabel T. Meisler, of Rochester, N.Y., and six stepgrandchildren.

The family suggests that expressions of sympathy may be in the form of contributions to the Navy Relief Society of the Heart Fund.