Walter Maria Kotschnig, 84, the deputy assistant secretary of State for international organizations from 1965 to 1971, died June 23 at the Penswood Village retirement community in Newtown, Pa. He had Alzheimer's disease.

Dr. Kotschnig was born in Judenburg, Austria. He was educated at the University of Graz, Austria, and the University of Kiel, Germany, where he earned a doctorate. He served in the Austro-Hungarian army in World War I.

In 1936, he came to the United States and settled in Northampton, Mass., where he taught comparative education at Smith and Mount Holyoke colleges.

He moved to the Washington area in 1944 and joined the State Department as acting chief of the division of international organizational affairs. The following year he was made chief of the division. He attended the Dumbarton Oaks conference in Washington at which the Allies agreed on the basic structure of the United Nations and the San Francisco conference at which the United Nations was founded in 1945.

In the course of his career at state, Dr. Kotschnig also attended numerous other meetings of the U.N. and its various bodies. After his retirement from the government in 1971, he served for two years as a consultant to the United Nations on the international narcotics traffic.

Dr. Kotschnig was a member of the Council on Foreign Relations and the Society of Friends. He lived in Chevy Chase until moving to Penwood Village in 1981.

His wife, the former Elined Prys, died in 1983. Survivors include two children, John Priest Kotschnig of Mill Valley, Calif., and Enid Kotschnig of New York City; a sister, Edeltraute Kotschnig of Neumarkt, Austria, and three grandchildren.