Tomás Antônio Maciel Monteiro, 1st Baron of Itamaracá (1780 – November 22, 1847) was a Brazilian politician and magistrate. He was born in Recife, Pernambuco, to Antônio Francisco Monteiro and Joana Ferreira Maciel Gouvim.
In 1804, he was sent to the University of Coimbra, where he graduated in law in 1809.
He was the deputy and later vice-governor of Pernambuco from 1839 to 1840, and the minister of the Brazilian Supreme Federal Court in 1842.
He was proclaimed the Baron of Itamaracá in 1843, in a post that would last until his death, in 1847.
Monteiro had a brother, named Manuel Francisco Maciel Monteiro, who was the father of Antônio Peregrino Maciel Monteiro, who would be the 2nd Baron of Itamaracá.