William Hague told the EUobserver following a meeting of foreign ministers in Brussels that the United Kingdom would not support a permanent operational HQ.
"We will not agree to it now and we will not agree to it in the future," Hague said, adding that a permanent military headquarters would duplicate NATO structures and would be a "waste of money."
The proposal was contained in a report by Baroness Catherine Ashton of Britain who is serving as the EU's high representative for foreign affairs and security policy.
Ashton told a news conference Hague's position did not come as a surprise.
"This is the same position as the previous British government," she said. "I am conscious you can't do much when unanimity of member states is required."
Kate Middleton recycles dress at movie premiere
Jordana Brewster on Paul Walker: 'He was an enormous presence in my life'