Hillel Seidel (Hebrew: הלל זיידל, 9 October 1920 – 14 February 1999) was an Israeli politician who served as a member of the Knesset for the Independent Liberals and Likud between 1974 and 1981.

Born in Kraków in Poland, Seidel was educated in a heder and yeshiva, before attending the College of Economic Studies in Vilnius.

In 1948 he made aliyah to Israel, where he became head of the Immigrant Absorption department of the World Confederation of General Zionists, a post he held until 1952.

He also became secretary general of the HaOved HaTzioni movement and a member of the Progressive Party's directorate.

However, on 15 February 1977 he left the party to establish the Ahdut faction, joining Likud.