John J. Sinsimer (March 19, 1923 – September 26, 1997) was an American politician who served in the New Jersey General Assembly from 1972 to 1976. He died on September 26, 1997, at his home in Pompton Lakes, New Jersey at age 74. He is the only Democrat to have represented the 24th District.

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{{DEFAULTSORT:Sinsimer, John J. 1923 births 1997 deaths Democratic Party members of the New Jersey General Assembly People from Pompton Lakes, New Jersey Politicians from Passaic County, New Jersey 20th-century American politicians