The Roma–Ostia Half Marathon (Italian: Roma Ostia Mezza Maratona or Italian: Maratonina Roma-Ostia)[1] is an annual half marathon road running event which takes place in early March in Rome, Italy.

The course begins in the EUR district of the city and follows a direct southeasterly route to the finish point near the beaches of Ostia.

[3] The competition is organised by the Gruppo Sportivo Bancari Romani in partnership with RCS Sports & Events comprises three distinct races.

There is an elite level race for male and female athletes, a popular fun run for amateurs, and a "Business Run" which sees teams of runners represent domestic companies in the Campionato Italian Imprenditori di Mezza Maratona (Italian Business Championships in the Half Marathon).

It was converted into an official half marathon race of 21.1 km for the 1987 edition and has remained so ever since.