Abraham Samson Onderwijzer

Abraham ben Samson ha-Kohen Onderwijzer (24 July 1862, Muiden - 17 November 1934, Amsterdam) was a Dutch rabbi.

He was chief rabbi of North Holland and founder of the Jewish labor union Betsalel.

He studied at the Amsterdam Rabbinical Seminary under Rabbi Dr. Joseph Hirsch Dünner.

With the other congregational unions of Amsterdam, Patrimonium and St. Eduardus, it supported the Algemeene Nederlandsche Diamantbewerkers Bond (ANDBB), though Betsalel was entirely independent of that organization.

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