Katherine G. Lowe, 69, a Fairfax County resident since 1953 who had been active in Army charitable and social organizations, died Sunday at Walter Reed Army Hospital. She had emphysema.

Mrs. Lowe was born in Hawaii while her father, Daniel D. Gregory, was serving as an officer in the 5th Cavalry. She was educated at schools near cavalry posts and attended St. Marys School in Charleston, S.C.

She and her husband, retired Army Col. Robert G. Lowe, were married on Mrs. Lowe's 18th birthday. Col. Lowe also was a cavalry officer and was accompanied by his wife to posts here and abroad.

Mrs. Lowe lived in the Philippines before World War II. Following the war, she accompanied her husband to Heidelberg, Germany, and Vienna, Austria. In both cities she was active in refugee and social work.

She was a founder and first president of the German-American Women's Club in Mannheim, Germany, while her husband was there from 1951 to 1953.

Mrs. Lowe spent six years in Korea during the 1960s and was active in social welfare work with the American-Korean Foundation. She also served as president of the Bamboo Circle, a Korean-American women's organization, in Seoul, Korea.

In addition to her husband, of the home in Falls Church, she is survived by two daughters, Katherine Knapp of Oxon Hill, and Laura Murph of Las Vegas, Nev., eight grandchildren and one great-grandchild.