John F. Mangan, 53, an employe development specialist for the Internal Revenue Service who had worked in the Far East for the Army Department and the Agency for International Development (AID), died Saturday at his home in Chevy Chase. He had a cardiovascular ailment.

Mr. Mangan, a Washington area resident since 1958, joined the IRS in the mid-1960s. He was assigned to the IRS National Training Center in Arlington as a specialist in the training and development of tax officials. He coordinated more than 70 courses for foreign tax officials and, in 1967, went to Vietnam as a tax consultant for the government of South Vietnam. He later helped arrange for several former Vietnamese tax officials to live in the United States.

He joined the Army in World War II and was stationed in occupied Japan after the war. He then became a civilian employe for the Army Department in the Far East, including four years on the island of Okinawa.

After AID was established in 1961, he worked for the agency as a training specialist.

Mr. Mangan was born in Wilkes-Barre, Pa., and graduated from King's College there. He earned advanced degrees from Syracuse University, the University of Notre Dame and University College in Dublin, Ireland.

Survivors include his wife, the former Isabel Del Portillo Mane, and three children, Javier, Pamela and Gloria, all of Chevy Chase, and two brothers, Edward of Wilkes-Barre and Joseph of Bear Creek, Pa.