Leopold (Lee) Gotzlinger, 48, a Foreign Service officer who senior adviser to the Joint Executive-Congressional Commission on Security and Cooperation in Europe, died of cancer Wednesday at Georgetown University Hospital.

he had been assigned to the commission last year after returning from a year's assignment as chief of the economic and commercial section in the American Consulate in Hong Kong.

Mr. Gotzlinger joined the Foreign Service in 1957. In addition to holding here, he had servied in Belgrade, Rotterdam, The Hague, Budapest and Sapporo, Japan.

Born in Vienna, Austria, Mr. Gotzlinger came to this country as a child and settled with his family in Youngstown, Ohio. After graduating from Ohio State University, he served in the Army from 1951 to 1953.

He was in Korea when he received his discharge and was granted special permission form Gen. Mark Clark to make his own way with another discharged soldier back to the United States.

Mr. Gotzlinger and his friend traveled from Japa n to India without trouble and parted company. Then his funds ran low, and he found himself hitchhiking, traveling mainly by ox cart.

Mt. Gotzlinger, after visiting his native Vienna, finally got back to the States and returned to Ohio State University to earn a law degree before joining the Foreign Service.

He is survived by his wife, Sakiko, and a daughteAlice, of the home in Rockville, and his mother, Rita Gotzlinger, of Youngstown.