Francisco Javier Sentmenat Oms y Vera de Santa Pau, 5th Marquis of Casteldosrius (7 January 1767 – 1 February 1842), was a Spanish army officer and senator.

[1] In 1793, he was transferred to the Calatrava Cavalry Regiment of the Roussillon Army, seeing action at the battles of Mas Deu, Perpignan, Truillas, and Boulou.

[1] Following the signing of the Treaty of Fontainebleau (1807), by which Carrafa was given the command of the Spanish corps of 7,500 infantrymen, 2,150 cavalry and 20 cannon that was to join Junot's French army at Alcántara, prior to the invasion of Portugal, in November 1807, Casteldosrius was sent to Porto at the head of two squadrons of his regiment.

[1] In 1819, he left that posting on being promoted to lieutenant general, colonel of the 2nd Regiment of the Guardias de Infantería Española and a member of the Supreme War Council.

Following Rafael del Riego's 1820 pronunciamiento, Casteldosrius declared himself on favour of the Constitution and was confirmed in his command of the 2nd Regiment until his appointment, in February 1822, as Captain General of Catalonia.