Roderic L. O'Connor, 61, an assistant administrator of the Agency for International Development in the Nixon administration and a special assistant to Secretary of State John Foster Dulles in the Eisenhower administration, died Oct. 24 at the Monmouth County Medical Center in Long Branch, N.J. He had Alzheimer's disease.

Mr. O'Connor, who lived in Far Hills, N.J., was born in New York City. He graduated from Yale University and later earned a law degree at Yale. During World War II, he was bombardier-navigator in the Army Air Forces and flew 50 missions in Europe in B-24 heavy bombers.

He first came to Washington as the administrative assistant of Dulles, who had been appointed to fill an unexpired term in the Senate. When Eisenhower took office in 1953 and Dulles became secretary of State, Mr. O'Connor was named his special assistant. He later was appointed deputy assistant secretary of State for congressional affairs and then administrator of the Bureau of Security and Consular Affairs at State.

In 1959, he moved to New Jersey as a vice president of the Ceba pharmaceutical company. In 1969, he returned here to join AID, where he ran its East Asia program. He resigned in 1972.

From 1973 until the late 1970s, when he retired for reasons of health, Mr. O'Connor was president of the Citizens Budget Commission in New York City, a civic group.

Survivors include his wife, the former Ingrid Ellgar, and two children, Michael J. and Tina, all of Far Hills, and two sisters, Collette Richardson, of Wilmington, Del., and Maureen Carlbom, of New York City.