Lucius Quintius Cincinnatus Elmer (February 3, 1793 – March 11, 1883) was an American Democratic Party politician who represented New Jersey's 1st congressional district in the U.S. Congress from 1843 to 1845.

During the War of 1812, he served in the militia as a lieutenant of artillery, and was promoted to the rank of brigade major and inspector.

[1] Elmer was elected in 1843 as a Democrat to the Twenty-eighth Congress in a district which comprises Atlantic, Cape May, Cumberland, Gloucester and Salem Counties (Camden County was created out of Gloucester in 1844), serving in office from March 4, 1843 – March 3, 1845, where he served as chairman of the Committee on Elections.

As a lame-duck Congressman, Elmer was the lone New Jersey Democratic vote against the annexation of Texas in January 1845.

Catharine Hay, daughter of Daniel Hay and Catharine Ferrier, was born in 1794 in Philadelphia, Pennsylvania and died on 27 October 1884 in Bridgeton, New Jersey at age 90, and was interred on 30 October 1884 in Old Broad Street Presbyterian Church Cemetery in Bridgeton, New Jersey.