The Temple of Portunus or Temple of Fortuna Virilis is a Roman temple in Rome, one of the best preserved of all Roman temples. Its dedication remains unclear, as ancient sources mention several temples in this area of Rome, without saying enough to make it clear which this is. It was called the Temple of Fortuna Virilis from the Renaissance, and remains better known by this name. If dedicated to Portunus, the god of keys, doors and livestock, and so granaries, it is the main temple dedicated to the god in the city.
It is in the Ionic order and located by the ancient Forum Boarium by the Tiber, during Antiquity the site overlooked the Port Tiberinus at a sharp bend in the river; from here, Portunus watched over cattle barges as they entered the city from Ostia.
The temple was originally built in the 3rd or 4th century BCE but was rebuilt between 120–80 BCE, the rectangular building consists of a tetrastyle portico and cella, raised on a high podium reached by a flight of steps, which it retains. Like the Maison Carrée in Nîmes, it has a pronaos portico of four Ionic columns across and two columns deep.