Joseph Cassidy (1866? – November 21, 1920), sometimes known as "Curley Joe," was a Democratic politician from Queens, New York City. He wielded a large amount of political power in the early 1900s, and was frequently accused of abusing it. Cassidy's first controversy arose when he was elected alderman of Long Island City, Queens while holding the appointed office of excise commissioner. Despite this apparent conflict of interest, he did not resign either of the positions, and won the right to hold both jobs after a court battle.