Thomas Phoenix was an American lawyer and politician from New York.
The family name Phoenix, sometimes spelled Phœnix, derives from the homophonous English family name Fenwicks which is pronounced like FENN-ix.
(This is quite different from the Greek mythological bird and the Arizona state capital which are pronounced like FEE-nix.)
He was New York County District Attorney from 1835 to 1838.
In 1836, he prosecuted Richard P. Robinson for the murder of Helen Jewett, but lost the case to Ogden Hoffman, his predecessor in the D.A's office, who appeared for the defence and secured Robinson's acquittal.