The service included readings by veterans and political leaders, musical performances and re-enactments from D-Day.
Here are some of the best pictures from the service.
1. D-Day 75
D-Day 75. Picture: Chris Moorhouse Photo: Chris Moorhouse
2. D-Day 75
Britain's Queen Elizabeth II attends an event to commemorate the 75th anniversary of the D-Day landings, in Portsmouth. Picture: JACK HILL/AFP/Getty Images Photo: JACK HILL
3. D-Day 75
Veterans gather on stage at the D-Day 75 Commemorations on June 5, 2019 in Portsmouth. Picture: Chris Jackson-WPA Pool/Getty Images Photo: Chris Jackson
4. D-Day 75
Performers dressed as soldiers perform during an event to commemorate the 75th anniversary of the D-Day landings, in Portsmouth. Picture: DANIEL LEAL-OLIVAS/AFP/Getty Images Photo: DANIEL LEAL-OLIVAS