It was not immediately clear how many agreements would be affected by the new policy, which refers to them as "lame-duck collective bargaining agreements."
Collective bargaining agreements are deals between unions and their employees that outline working conditions, pay, and other policies.
The move comes as Trump embarks on a massive makeover of the U.S. government, firing and sidelining hundreds of civil servants in his first steps toward downsizing the bureaucracy and installing more loyalists.
The memo cites a Department of Education collective bargaining agreement reached three days before Trump took office that "generally prohibits the agency from returning remote employees to their offices."