Rabbi Yaakov Yitzhak Neumann or Neimann (1920, Pápa, Hungary – 2007, Montreal), also known as "Pupa Rav", was the rabbi of Montreal's Belzer hasidim from 1953 until his death in 2007.

Neumann was born in Pápa, Hungary.

His father Yosef ben Benzion Neuman was also a rabbi.

[citation needed] After surviving the Holocaust, in which his wife and only son, Nuchem, were killed, Neumann served as head of the remaining Hungarian Pápa community (c. 1948), from which he gained the title, Puper Rav.

He then emigrated to Australia and then in 1953 to Montreal where there was a Belzer community.