Harry, 30, will tell of his delight that the 103 members of the British Armed Forces Team at the Invictus Games have won a Special Recognition award at the event, which will take place at Mayfair's swanky Grosvenor House.
It is the first time that the fourth-in-line to the throne will appear at the awards.
The team captured the hearts of the nation as they took on competitors from 12 other countries in a number of different sports last month in the Invictus Games, the sporting event for wounded and sick service personnel which Harry founded himself.
In his speech, Prince Harry will tell the audience: "The Invictus games shone a spotlight on the incomparable character of servicemen and women and their families. "Their stories move, inspire and humble me.
"They are as amazing as they are unique and I am absolutely delighted that the team is receiving this Pride of Britain Award."
Harry, who served as an Apache helicopter pilot in Afghanistan, will also tell his comrades: "To fight for your country takes courage but to move beyond life changing injuries takes an extraordinary level of grit and determination.
"I can only begin to imagine how challenging the journey of recovery is, but the admiration I have for these men and women is limitless."
Prince Charles will also be at the awards. He will pay tribute to the hard work of the recipient of The Prince's Trust Young Achiever Award, Georgia Hardie.