If you are looking for a religious leader, they are Rabbis. Most synagogues also have an elected board that works with the Rabbi(s) in regard to determining how the synagogue operates and the services offered.
However, Jewish communities have different associations and leaders for these associations which play a major role in the community as a whole. These secular leaders influence community events.
Jews do not have a centralised leadership either at the local, national, or international level.
There were many German-Jews who at the time of the WWII, but there wasn't really a "Good" leader who was all that great to the Jews. The Jews were basically cut to nothing by all the Germans.
Moses.
The leader of a local government is usually the Mayor.
Joshua was the first leader to lead the Jews into Canaan.
Marshall Josip Broz Tito, Yugoslavian leader.
In ancient times, the Jews had kings and high priests. Since the year 70 CE, there has been no single leader of the Jews.
In ancient times, the Jews had kings and high priests. Since the year 70 CE, there has been no single leader of the Jews.
Hitler
He was the leader of the mass extermination of Jews
Rabbi
Hadrian
The Moschiach. And are still waiting.