Ellis James Abdnor was an American politician who served as a member of the United States Senate from South Dakota. He was also the 15th Administrator of the Small Business Administration under presidents Ronald Reagan and George H. W. Bush.

The administrator of the Small Business Administration is the head of the Small Business Administration of the United States. The administrator is responsible for managing and the day-to-day operations of the agency. The administrator is nominated by the president of the United States and must be confirmed by a vote of the Senate.