Patricia Ann Johnson, 73, who organized women's clubs and study groups for diplomatic wives and who was recognized for her charitable and volunteer work overseas as the wife of U. Alexis Johnson, a former ambassador and undersecretary of State, died Wednesday at Sibley Memorial Hospital. She had pneumonia.

Mrs. Johnson, the former Patricia Ann Tillman, was born in Hyattsville.

She attended old Central High School here and the Unversity of California.

In 1932, she married Mr. Johnson, a specialist on the Far East, and in 1935 accompanied him to Tokyo, his first post as a Foreign Service officer. She also accompanied him to the 11 other posts in which he served during his 42-year diplomatic career. Each of the Johnsons' four children was born in a different country.

In 1966, she and her husband returned to Tokyo, when Mr. Johnson was appointed ambassador to Japan.

In the early 1950s, while her husband was ambassador to Czechoslovakia, Mrs. Johnson organized the first Diplomatic Wives Woman's Club. About 70 wives of western diplomats were members. They studied languages, art, dressmaking, and cooking and participated as teachers as well as students.

In 1960, Mrs. Johnson received an award from the queen of Thailand for her work on behalf of the Red Cross and other Thai charities. She and her husband lived in Bangkok from 1958 to 1961, while he was amabassador there.

While living in Tokyo in the late 1960s, Mrs. Johnson engaged in volunteer work on behalf of wounded Vietnam veterans who were hospitalized in Japan.

She was a member for more than 50 years of Foundry Methodist Church in Washington and a member of the daughters of the American Revolution, the Washington and Chevy Chase clubs and the Association of Amercian Foreign Service Women.

Mrs. Johnson, who lived in Washington, founded the Washington-Bangkok Women's Club and served as an honorary vice president of the Washington chapter of Ikebana International. She was an honorary member of the Washington-Tokyo Women's Club.

She was awarded the Distinguished Honor Award of the Central High School Alumni Association.

Besides her husband, of Washington, survivors include two sons, Stephen T., who is with the U.S. Embassy in Bucharest, Romania, and William T. K., of LaCanada, Calif.; two daughters, Judith A. Zerbe and Jennifer E. Bishop, both of Santa Monica, Calif.; a half-sister, Ruth A. Morlan, and a half-brother, Robert D. Tillman, both of Brentwood, Md., and seven grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Association of American Foreign Service Women, c/o Department of State, Washington.