The former PM has been made a Knight Companion of the Garter.
The Queen bestows the oldest and most senior distinction in the British system, currently held by only 21 people.
Sir Tony's detractors reacted strongly to the revelation in the New Year's Honours list.
A Change.org petition accuses the former PM of ‘war crimes' and of being ‘the least deserving of any public honours'.
Sir Tony's reputation has been harmed by his decision to invade Iraq and Afghanistan, notwithstanding his tremendous support as Labour leader.
The Chilcot Inquiry found in 2016 that the Iraq mission began on the basis of ‘unjustified certainty' in intelligence and before diplomatic options had been exhausted.
For their dedication and commitment to our country, Sir Tony praised ‘all those who worked alongside me in politics, public service and all areas of our society'.
David Cameron should get it too, says Commons Speaker Sir Lindsay Hoyle, because it is ‘one of the world's toughest positions'.
So, despite what people say, it is one of the most difficult occupations in the world, and I believe it is both respectful and appropriate.
‘They should all be knighted when they leave office.
‘I believe if you were the Prime Minister of this country, the country should recognise your service.'
‘It's not about politics, it's about the respect we show those who have led our country.
‘I think it's a fitting homage to their work.'
Edward III founded the Garter in 1348 to honour extraordinary civic service and success.
Sir Tony joined Baroness Valerie Amos and the Duchess of Cornwall as new royal appointees.