The Roma-Ostia Half Marathon (Italian: Roma Ostia Mezza Maratona or Italian: Maratonina Roma-Ostia) 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 south-easterly route to the finish point near the beaches of Ostia. It is Italy's most popular half marathon, with a record 12,000 entries and 9,485 finishers in 2011. The 2020 edition of the race was cancelled due to the coronavirus pandemic.