Galtier succeeded Mauricio Pochettino after the previous campaign, and the team triumphed easily in Tel Aviv, Israel.
After setting up Lionel Messi’s first goal, Neymar curled in a free kick.
Before Neymar was fouled by Jean-Charles Castelletto, afterward dismissed, and converted the penalty, Sergio Ramos made it three with a backheel.
The French version of the Community Shield, the Trophees des Winners, has now been won by PSG, the Ligue 1 champions, nine times in the last ten years. Nantes earned a spot in the game by winning the French Cup.