The 1925 Workers' Summer Olympiad was the second edition of International Workers' Olympiads. The games were held from July 24 to July 28 at Frankfurt am Main in Germany. Total number of participants was more than 100,000 of which 3,000 were actual athletes from 12 countries. The rest were spectators who were invited to take part on mass gymnastics that underlined the ideas of worker sports. Motto of the 1925 Olympiad was "Nie wieder Krieg!" – No More War!