King Felipe made a speech in Paris on Wednesday in the company of the French President, Emmanuel Macron, to mark the 16th European Day of Remembrance of the Victims of Terrorism.
The event was organised this year in France and the ceremony was held at the Trocadero by the Eiffel Tower with a smaller crowd than originally planned because of the coronavirus restrictions.
The date also marked the 16th anniversary of the Madrid train bombings, the biggest terrorist attack in Spain when 192 died, and the King had been invited to the event by the French.
In his speech, the King said, "Making the results of terrorism and the suffering it causes visible, as the victims do, is the best way to combat it."
He added that remembering victims, "is what we owe them, to heal the deep wounds that continue to be present in society".
King Felipe began his speech expressing the gratitude of Spain for the solidarity that France had always shown.
"Spain and France are two nations linked by their past, present and future," he explained.
He continued by paying special tribute to the family members of victims of the Madrid bombing.
The King also expressed Spain's wish to host this annual European remembrance event next year.