The pair last saw each other King Charles’s coronation last May.
Prince Harry has secretly returned to the UK and “reunited” with his estranged brother Prince William for their uncle’s funeral.
The Duke of Sussex, who turns 40 next month, reportedly sat at a distance from the heir to the throne at Lord Robert Fellowes’s service in Norfolk.
Lord Fellowes, 82, passed away on 29 July. He was married to Princess Diana’s older sister and served as Queen Elizabeth II’s private secretary for several years.
It is believed to be the first time that the two brothers have publicly seen each other since King Charles’s coronation last May.
Their encounter comes as the Prince and Princess of Wales’s end-of-summer plans have been revealed ahead of William’s return to duty on 5 September.
The couple took to social media to share that they are “looking forward to” watching the Paralympic Games.
“Looking forward to another few weeks of incredible sport!” they said in a joint Twitter/X post. “Wishing the very best of luck to our @ParalympicsGB athletes and all those competing at #Paris2024.”