Abraham "Bo" Weinberg (January 7, 1900 – September 9, 1935) was a Jewish[1] New York City mobster who became a hitman and chief lieutenant for the Prohibition-era gang boss Dutch Schultz.

As Schultz expanded his bootlegging operations into Manhattan during Prohibition, he recruited Abe Weinberg and his brother George into his gang.

Abe Weinberg would become one of Schultz's top gunmen during the Manhattan Bootleg Wars and was a suspect in the later high-profile gangland slayings of Jack "Legs" Diamond, Vincent "Mad Dog" Coll, and mob boss Salvatore Maranzano.

Rather than face the charges, Schultz went into hiding and Weinberg assumed control of his criminal operations.

When Schultz returned from hiding and won acquittal on the charges against him, he became suspicious of Weinberg, as it was rumored that Weinberg had been secretly negotiating with mob boss Lucky Luciano and Murder, Inc. boss Louis Buchalter to retain control of the Schultz organization.