Catherine Lady Moore, 83, who had been active in charitable organizations, died of cancer Saturday at Washington Hospital Center.

During the 1940s, Lady Moore helped establish birth control clinics in Washington and did volunteer work with the Girl Scouts. She served as head of the nursing committee of the Washington Home.

She did volunteer work with the international activities section of the American Red Cross, and in 1948 was awarded the King Christian Medal by the Dauish government for her special services to the Red Cross and Denmark.

Lady Moore was born in New York City and attended Miss Porter's School in Farmington, Conn. She was a Washington debutante.

She accompanied her first husband, Vice Adm. Theodore S. Wilkinson, to posts in Hawaii, California, and the Panama Canal Zone. The family maintained a home in Arlington. Adm. Wilkinson died in 1948.

She lived in Kent, England, for more than 25 years with her second husband, retired British Adm. Sir Henry Moore, before his death in April 1978. Lady Moore then returned to Washington.

She was a member of St. John's Episcopal Church at Lafayette Square.

Survivors include a son, Theodore S. Wilkinson Jr., of New York City; a daughter, Joan Sadler, of San Franciso, and 11 grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to either the Washington Home or St. John's Episcopal Church. CAPTION: Picture, CATHERINE LADY MOORE