Leon Abbett (October 8, 1836 - December 4, 1894) was a U.S. politician.

Born in Philadelphia, Pennsylvania, the son of Ezekiel and Sarah (Howell) Abbett, on his 26th birthday, he married Mary Briggs. A lawyer, he soon entered politics in New Jersey and was elected as a Democrat to the New Jersey State Assembly, where he served from 1864-1866 and 1869-1870. He also served one term in the New Jersey State Senate from 1875-1877. Active in New Jersey Democratic politics, he was elected Governor of New Jersey and served two non-consecutive terms from 1884-1887 and again from 1890-1893. Following his service as Governor, he became an Associate Justice of the New Jersey Supreme Court from 1893 until his death the following year. He is buried in Green-Wood Cemetery in Brooklyn, New York.