Prince Franz Seraph of Orsini-Rosenberg (18 October 1761 – 4 August 1832) was born a member of Orsini-Rosenberg family, son of Prince Vinzenz Fererius von Orsini-Rosenberg and Maria Juliana, Countess von Stubenberg.
He joined the army of Habsburg Austria and fought against the Ottoman Turks, winning a prestigious award for bravery.
In the 1790s, he served in the wars against the First French Republic and received promotion to general officer.
During the Napoleonic Wars he led a division in 1805 and an army corps in 1809.
He became a member of the Hofkriegsrat (Aulic Council) in 1811.
He was the Proprietor (Inhaber) of an Austrian light cavalry regiment from 1801 until his death.