Ya'akov Yechezkiya Greenwald (Hebrew: יעקב יחזקי' גרינוואלד. Legal name: Jakab Grünwald. Also called the "Vayaged Ya'akov", 1882 – c. 1 March 1941 (2 Adar 5701)) was the rabbi of the Etz Chaim community in Pápa, Hungary, and the rosh yeshiva there. He was the predecessor of the Pupa Hasidic dynasty.