It is the latest act Harry has completed to honour war veterans as he and wife Meghan "personally recognised" Remembrance Sunday by laying a wreath in Los Angeles earlier this month.
The Duke and Duchess honoured those who had died fighting for their country by placing flowers on the graves of two Commonwealth soldiers and also left a wreath, with a personal message, at the cemetery obelisk.
A spokesman for the couple, who moved to the US after stepping down as senior royals earlier this year, said: "It was important to the Duke and Duchess to be able to personally recognise Remembrance in their own way, to pay tribute to those who have served and to those who gave their lives.
"The couple laid flowers that the duchess picked from their garden at the gravesites of two Commonwealth soldiers, one who had served in the Royal Australian Air Force and one from the Royal Canadian Artillery.
"The duke signed a message with the wreath saying: 'To all of those who have served, and are serving. Thank you'."
