José Tomás de la Luz Mejía Camacho, better known as Tomás Mejía (September 17, 1820 – June 19, 1867), was a Mexican soldier.
Born in Pinal de Amoles, Sierra Gorda, Querétaro, he fought as a cavalry general on the side of Maximilian I of Mexico during the war between Monarchists and Republicans after the French intervention in 1862 and the rise of the Second Mexican Empire in 1863-1864.
He was executed by the Liberal Republicans, together with General Miguel Miramón and Emperor Maximilian I in Querétaro in 1867.