Hillel (Hebrew: הִלֵּל Hīllēl; variously called Hillel HaGadol, Hillel HaZaken, Hillel HaBavli or HaBavli,) was a Jewish religious leader, sage and scholar associated with the development of the Mishnah and the Talmud and the founder of the House of Hillel school of tannaim. He was active during the end of the first century BCE and the beginning of the first century CE.

He is popularly known as the author of two sayings:

(1) "If I am not for myself, who will be for me? And being for myself, what am I? And if not now, when?";

(2) "That which is hateful to you, do not do unto your fellow. That is the whole Torah; the rest is the explanation; go and learn."