Alexander Marmorek (Hebrew: אלכסנדר מרמורק; February 19, 1865 – July 12, 1923) was a Galician-born French bacteriologist and Zionist leader.

Initially an obstetrician, he turned to bacteriology and first attracted Pasteur's attention with his investigations into the role lymphatic glands in the body's defense against bacteria.

[3] In 1911, his anti-consumption cure was used on the Russian Minister of Foreign Affairs Sergey Sazonov, for which Sazanov sent a letter thanking Marmorek.

[9] In 1910, he married Rachel Steinberg, a doctor who served as director of the orthopedic department in Paris' largest children's hospital.

Félix Mesnil of the Pasteur Institute, Leo Motzkin of the World Zionist Organization, M. Sliosberg, Hillel Zlatopolski, M. Allienkoff, M. Fischer of Holland and M. Ornstein of Belgium were among those who attended the funeral.

[11] He was buried in Cimetière parisien de Bagneux, although in 1954 French Zionists approached the Israeli government have his remains reburied in Israel.

[12] In 1930, a Yemenite settlement was established one and a half kilometers from Rehovot by the Jewish National Fund and named after Marmorek.