Thomas Hoo, 1st Baron Hoo and Hastings KG (ca. 1396-1455) was a Knight of the Garter and English courtier.
Thomas was the son of Sir Thomas Hoo (ca. 1370 – Luton Hoo, Bedfordshire, 23 August 1420) and wife (m. 1395) Eleanor de Felton (Litcham, Norfolk, 1378 – 8 August 1400). He succeeded his father in 1420, inheriting the family's ancestral home of Luton Hoo in Bedfordshire as well as Mulbarton, Norfolk and other estates. He fought for Henry VI of England in France, and for his services was made, first Keeper of the Seals, then Chancellor of France. In 1439, he was granted the castle, lordship and honour of Hastings, and in 1445 elected Knight of the Garter. Two years later he was created Baron of Hoo and Hastings.
Lord Hoo was twice married. His first wife was Elizabeth Wychingham, the daughter of Nicholas Wychingham of Witchingham, Norfolk, whom he married by settlement dated 1 July 1428. By her he had one daughter, Anne, who married Sir Geoffrey Boleyn, mercer and Lord Mayor of London.