Muller Lazar (Lasar) (born 2 August 1909 in Kreutzburg [Krustpils]) — rabbi.

Lazar Muller attended the Jewish elementary school in Jakobstadt (Jēkabpils). From 1923 to 1928 he studied at the Riga yeshiva, and in 1929 he trained as a ritual slaughterer (shochet) in Jēkabpils. While working as a shochet in Nereta, he studied the Talmud and taught Jewish religious law to Jewish children at the six-year school in Nereta. He served as rabbi in Nereta from 3 April 1936.