Eliyahu (Eljasz) Mazur (Hebrew: אֵלִיָּהוּ מָזוּר, 1889 – 24 September 1973) was a Polish-Israeli activist and politician.

Born in Zagórów in the Russian Empire (today in Poland), Mazur received a religious education.

He founded a branch of the Mizrachi movement, but later joined Agudat Yisrael, becoming a member of the Polish branch's executive committee, and later a member of the World Agudath Israel committee.

In 1940 he made aliyah to Mandatory Palestine, where he established a diamond company in Tel Aviv.

He narrowly missed out on a seat in the elections for the first Knesset in 1949, but entered the parliament when Moshe Kelmer resigned on 11 March that year.