Robert Gray Nixon Sr., 75, a retired journalist and public relations specialist, died of cancer March 11 at Suburban Hospital. He lived in Bethesda.

Mr. Nixon, who began his career as a newsman in the early 1920s, was associated with the International News Service for 29 years before its merger in 1958 with United Press.

He was attached to the Washington Bureau of INS as State Department reporter for three years before being assigned as a war correspondent attached to the British Army in London in 1939. The following year, he became the first air raid casualty among members of the news service's London staff when he was grazed on the head by a piece of shrapnel during the Blitz. Later in World War II, he covered the African Campaign and the Casablanca and Yalta Conferences.

He was the INS White House correspondent for more than 10 years and was elected president of the White House Correspondents' Association in 1949.

Mr. Nixon was awarded the George R. Holmes Memorial Trophy in 1952 for the best work produced by an INS reporter.

After his retirement from journalism in the mid-1950s, he worked for a Washington public relations firm. He retired a second time in 1963.

Mr. Nixon, who was born in Atlanta, worked at his hobby of restoring antique furniture for family and friends.

Survivors include his wife, the former Ann (Agnes) Utley, of Bethesda; two sons, Robert G. Jr., of Lakeland, Fla., and Dene S.G., of Rockville; a sister, Loula N. Cantrell of Atlanta; four grandchildren, and one great-grandchild.

The family suggests that expressions of sympathy be in the form of contributions to the American Cancer Society.