Tony Blair is donating all the profits from his memoirs to a new sports centre for injured troops.
A spokesman for the former Prime Minister confirmed he will hand over the reported £4.6 million advance he received for the book, A Journey, as well as any royalties.
The money will go towards the Royal British Legion's Battle Back Challenge Centre, which is due to open in summer 2012.
A spokesman said:"As prime minister he witnessed that for himself in Iraq, Afghanistan, Northern Ireland, Sierra Leone and Kosovo. This is his way of honouring their courage and sacrifice."
Mr Blair is a controversial figure for taking Britain to war in Afghanistan and Iraq - campaigns which have seen hundreds of troops killed and wounded.
It is understood the money is being given with "no strings", such as a say on the name of the new centre.
Director-general of the Royal British Legion Chris Simpkins said it was "delighted to accept this very generous donation".
Most injured personnel who are able to return to active duty are expected to go through the £12 million Battle Back Centre as part of their recovery.
It will provide accommodation and a state-of-the-art gym and training facility.