Geoffrey Parsons Jr. 73, a former chief press officer and director of information for the North Atlantic Treaty Organization and editor of the International Herald Tribune in Paris, died Thursday at his home at Benisa, Alicante, Spain. He had a heart ailment.

Mr. Parsons, who was born in New York City, was educated in France and at Harvard University, where he graduated in 1931. He worked for the Boston Globe and later was the Chicago correspondent of the old New York Herald Tribune. In World War II, he became chief of the Herald Tribune's London bureau.

In 1944, with the liberation of Paris, Mr. Parsons was named editor of the International Herald Tribune. The newspaper, which had been closed during the German occupation, went back into print on Dec. 14, 1944. Mr. Parsons remained its editor until 1950.

He then became chief press officer and director of information for NATO, working under the organization's first secretary-general, Lord Ismay, and his successor, Paul-Henri Spaak.

In 1957, Mr. Parsons resigned from NATO and became a vice president of the Northrop aircraft company in charge of its European operations. He retired in 1978.

Survivors include his wife, the former Drue Tartiere, a son, Geoffrey, and three grandchildren.