The Take That star attended a reception at Buckingham Palace tonight (October 16), which the Queen and the Duke of Edinburgh hosted to thank those who contributed.
Barlow, who composed the official Jubilee song 'Sing' with Andrew Lloyd Webber and organised the Jubilee concert, told BBC News: "I just thought the event deserved such notice from everybody.
"I think everybody was so proud that the Queen had made it to this point and the amazing job she has done for so long for us all. We were all just proud to be a part of it."
Speaking of the concert, he added: "I was looking round thinking, 'Are we really here?' It was totally incredible and luckily everything went to plan.
"I think we got it right, I think it opened up an amazing summer for our country."
Celebrity chef Heston Blumenthal was also present at the reception after helping prepare a picnic for 12,000 ticket holders in the grounds of the palace on June 4.
Barlow, who is also a judge on The X Factor, received an OBE following his involvement in Her Majesty's Diamond Jubilee celebrations.
Watch the video for 'Sing' by Gary Barlow below: