Thomas Jackson Oakley (November 10, 1783 - May 11, 1857) was a United States Representative and New York State Attorney General. Born near Poughkeepsie, he graduated from Yale College in 1801, studied law, was admitted to the bar in 1804 and commenced practice in Poughkeepsie. He was surrogate of Dutchess County in 1810 and 1811, and was elected as a Federalist to the Thirteenth Congress (March 4, 1813-March 3, 1815).
Oakley was a member of the New York State Assembly in 1816 and from 1818 to 1820 he was attorney general of New York in 1819 (under Governor De Witt Clinton), and was again elected to Congress, serving from March 4, 1827, until May 9, 1828, when he resigned to go on the bench. He was judge of the superior court of New York City from 1828 to 1847, and was appointed chief justice in October 1847 and served until his death in New York City in 1857. Interment was in Trinity Churchyard.