Fortunatus is a Latin word meaning "happy, lucky, rich, blessed". A masculine given name, it can refer to:

• Fortunatus the Apostle, one of the 70 Disciples of Jesus Christ, companion of Achaicus of Corinth
• Fortunatus (1st century), martyred with Orontius and Justus
• Fortunatus (died c. 70), a deacon martyred with Hermagoras of Aquileia
• Fortunatus (died 212), martyred with SS Felix and Achilleus
• Fortunatus of Casei (died 286), a martyr
• Fortunatus (died 303), a deacon martyred with SS Felix of Thibiuca, Audactus, Januarius, and Septimus
• Fortunatus of Naples, 4th century bishop of Naples
• Fortunatus of Spoleto (died 400), a priest near Montefalco
• Fortunatus of Todi (died 537), bishop of Todi
• Venantius Fortunatus (died in the early 7th century), a poet and bishop of Poitiers

• Fortunatus Dwarris (1786–1860), English lawyer and author
• Fortunatus Hueber (1639–1706), German Franciscan historian and theologian
• Fortunatus M. Lukanima (1940–2014), Roman Catholic bishop
• Fortunatus Nwachukwu (born 1960), Roman Catholic apostolic nuncio to various Caribbean nations
• Fortunatus Wright (1712–1757), English privateer
• Emerich Szerencsés (died 1526), known as Fortunatus, deputy treasurer of the Kingdom of Hungary and a Jewish convert to Christianity
• Heinrich Glücksmann (1864–1947), Moravian-born Austrian author who used the pseudonym Fortunatus

• the protagonist of Fortunatus, a German proto-novel or chapbook about a legendary hero popular in 15th- and 16th-century Europe
• the protagonist of Old Fortunatus, a 1599 play by Thomas Dekker
• a character in "King Fortunatus's Golden Wig", a French fairy tale

• Venantius Fortunatus (530–600), Latin poet and hymnodist, bishop and saint
• Edward Fortunatus (1565–1600), Margrave of Baden-Rodemachern and Baden-Baden
• Herman Fortunatus, Margrave of Baden-Rodemachern (1595–1665), son of Edward Fortunatus
• Publius Aelius Fortunatus, 2nd century Roman painter