Lazarus Jacob Riesser (né Katzenellenbogen, Hebrew: אליעזר ליזר בן יעקב קצנאילנבוגן; 1763 – March 7, 1828) was a German rabbi.
Riesser was born in the valley of Riess, the son of Jacob Katzenellenbogen, rabbi of Öttingen-Wallerstein.
Riesser was known for his great erudition in the Talmud and his keen intellect, which led to his being chosen as the son-in-law of Raphael Cohen, the incumbent of the rabbinate of Altona-Hamburg-Wandsbek.
When Kohen resigned his post in 1799 due to disagreements with the Danish government, Riesser lost his office and moved to Hamburg with his father-in-law.
In his spare time, he wrote his father-in-law's biography, titled Ma'alele Ish.