There was a demonstration of jeu de paume at the Olympic Games in 1924. The event was called real tennis at the time, though this sport is different to what is currently called real tennis. On the same program in 1924 was lawn tennis, what we now just call tennis

Jeu de paume was also a medal sport at the 1908 Olympics, and an outdoor variation of jeu de paume called longue paume was a demonstration sport in 1900.

(Lawn) Tennis was demonstration sport at the Olympics in 1968 and 1984.