St. Mary's Abbey Church is a historic Catholic church in the Archdiocese of Newark, located at 528 Martin Luther King Blvd (formerly High St.) and William St. in Newark, New Jersey.

The parish was established in 1842 to serve the needs of working-class German-speaking immigrants who worked in Newark's factories.

It met originally in a wooden church, but this was destroyed in 1856 by anti-Catholic Know Nothing elements.

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