WASHINGTON (AP) _ David G. Newton, a foreign service officer, has been nominated as the first U.S. ambassador to Iraq since the resumption of diplomatic relations between the two countries, the White House announced Friday.

Newton, 50, a native of Boston, has been the charge d'affaires at the Baghdad embassy for the past five months when diplomatic ties were resumed.

Between 1981 and 1984, Newton was the political counselor at the U.S. interests section in Baghdad.

Newton, a graduate of Harvard College with a master's degree from the University of Michigan, must be confirmed by the Senate.

He has wide experience in the Middle East, and has served in posts in Yemen, Saudi Arabia, and deputy chief of mission in Damascus, Syria.

The president made two other ambassadorial nominations Friday. They are:

-William A. Brown as ambassador to Thailand, succeeding John Gunther Dean. Brown, 55, of Winchester, Mass., is a career foreign service officer, serving most recently as deputy assistant secretary of state for East Asian and Pacific affairs.

- Harry George Barnes Jr., as ambassador to Chile, succeeding James D. Theberge. Barnes, 59, of St. Paul, Minn., has been ambassador to India since 1981. He also has served as ambassador to Romania and director general of the foreign service.