The service included readings by veterans and political leaders, musical performances and re-enactments from D-Day.
World leaders including Donald Trump, the Queen, Angela Merkel and Theresa May were in the royal box to watch the event.
Here are some of the best pictures from the service.

5. D-Day 75
Guests watch during an event to commemorate the 75th anniversary of the D-Day landings, in Portsmouth. Picture: TOLGA AKMEN/AFP/Getty Images | Getty Images Photo: -

6. D-Day 75
Queen Elizabeth II and US President, Donald Trump. Picture: Chris Jackson-WPA Pool/Getty Images | Getty Images Photo: -

7. D-Day 75
Helicopters fly over the stage as Sheridan Smith sings during the D-Day 75 event on Southsea Common | Getty Images Photo: -

8. D-Day 75
French President Emmanuel Macron kisses US First Lady Melania Trump in greeting as they attend an event to commemorate the 75th anniversary of the D-Day landings, in Portsmouth. Picture: JACK HILL/AFP/Getty Images | Getty Images Photo: -

