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.

21. D-Day 75
Veterans take part in the event to commemorate the 75th anniversary of the D-Day landings, in Portsmouth. Picture: MANDEL NGAN/AFP/Getty Images | Getty Images Photo: -

22. D-Day 75
French President Emmanuel Macron stands and speaks during an event. Picture: DANIEL LEAL-OLIVAS/AFP/Getty Images | Getty Images Photo: -

23. D-Day 75
Members of the public watch a fly past during an event to commemorate the 75th anniversary of the D-Day landings, in Portsmouth. Picture: ISABEL INFANTES/AFP/Getty Images | Getty Images Photo: ISABEL INFANTES

24. D-Day 75
Members of Britain's Household Cavalry react during an event to commemorate the 75th anniversary of the D-Day landings, in Portsmouth. Picture: CHRIS JACKSON/AFP/Getty Images | Getty Images Photo: -

