The 42-year-old Scotsman went to Buckingham Palace to collect the OBE - Order of the British Empire - from Prince Charles. He received the MBE - Member of the British Empire - in 1998.
Montgomerie made the putt that clinched Europe's record 18 -9 Ryder Cup victory over the United States at Oakland Hills. Montgomerie has an overall Ryder Cup record of 19-8-5.
'This was awarded I think on behalf of the Ryder Cup team of 2004,' Montgomerie said after Wednesday's ceremony. 'We won in America and I was probably the oldest player. I was the one at the helm of it I suppose, and in a way I take it for them, the whole team.'
Montgomerie won his eighth Order of Merit, or European money title, this season. It was his first time back at the top of the list since winning his seventh straight in 2000.
'I don't think really in sport you can come back that often,' he said. 'So it's nice to do it and let's see if we can do it again.'
Montgomerie has never won a major championship.
'All I can do is keep trying and if one day the door opens and I walk through it, great,' he said. 'Otherwise I'll leave with a very good career of Ryder Cup wins and Order of Merits. There's nothing to be ashamed of if I don't win a major.'
Attending the ceremony were Montgomerie's three children, Olivia, 12, Venetia, 9, and Cameron, 7. Montgomery and his wife, Eimear, divorced in 2004 after 14 years of marriage.
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