Francesco Domenico Guerrazzi (12 August 1804 – 25 September 1873) was an Italian writer and politician involved in the Italian risorgimento.
Guerrazzi was born in the seaport of Livorno, then part of the Grand Duchy of Tuscany. He studied law at the university of Pisa, graduating in 1824. He began to practice in Livorno, but soon gave up law in favour of politics and literature, being particularly influenced by Byron, to whom he dedicated his "Stanze" (1825). His first novel, La Battaglia di Benevento was published in 1827.
Giuseppe Mazzini made his acquaintance, and in 1829, together with Carlo Bini, they started a newspaper, L'Indicatore Livornese, at Livorno. The authorities of the Grand Duchy of Tuscany suppressed the periodical in February 1830 after 48 issues.
In the same year Guerrazzi was banished to Montepulciano for six months after writing an oration to the memory of Cosimo Del Fante — a native of Livorno who had embraced the ideals of the French Revolution and whom Guerrazzi held up as an example for the idealists of the risorgimento. While confined to Montepulciano he began work on his most famous novel, L'Assedio di Firenze - based on and greatly glorifying the life of the 16th Century Florentine soldier Francesco Ferruccio.
Guerrazzi was to be imprisoned several times for his activity in the cause of "Young Italy"; in 1833 he was locked up for three months in the Forte Stella at Portoferraio.
Subsequently he became the most powerful Liberal leader at Livorno. In 1848 Guerrazzi was appointed a minister, with some idea of mediating between the reformers and the grand duke of Tuscany, Leopold II. On 8 February 1849, following Leopold’s flight, Guerrazzi formed a governing triumvirate with Giuseppe Mazzini and Giuseppe Montanelli and a republic was proclaimed; on 27 March Guerrazzi was nominated dictator.