Agudat Yisrael is a Haredi Jewish political party in Israel. It began as a political party representing Haredi Jews in Poland, originating in the Agudath Israel movement in Upper Silesia. It later became the party of many Haredim in Israel. It was the umbrella party for many, though not all, Haredi Jews in Israel until the 1980s, as it had been during the British Mandate of Palestine.

Haredi Judaism consists of groups within Orthodox Judaism that are characterized by their strict interpretation of religious sources and their accepted halakha and traditions, in opposition to more accommodating or modern values and practices. Its members are usually referred to as ultra-Orthodox in English; however, the term "ultra-Orthodox" is considered pejorative by many of its adherents, who prefer terms like strictly Orthodox or Haredi. Haredi Jews regard themselves as the most religiously authentic group of Jews, although other movements of Judaism disagree.