Naval is a 2nd class municipality in the province of Biliran, Philippines. It is the capital municipality of Biliran. According to the 2010 census, it has a population of 48,799 people.

The territory of Naval comprises a total land area of 10,710 hectares, which is 19.27 percent or 1/5 of the total land area of Biliran.

The town of Naval was once named Bagasumbol, which was perceived by natives as being too warlike a description. The aboriginal name was later modified in 1859 to a more peaceful name—the presently known Naval.

On May 26, 1860, Naval was separated from Biliran, but it became an independent parish only in September later that year. The following year, on July 31, 1861, Msgr. Romualdo Ximeno, Bishop of Cebu, officially declared Naval an independent parish. In August 1861, Father Santos de Santa Juana took up formal residence as the first parish priest of Naval and served the town for twenty-one years until 1882.

On September 26, 1869, Naval was officially established and recognized as an independent pueblo (town).

Biliran is a province in the Philippines located in the Eastern Visayas region. An island province, Biliran lies just a few kilometers north of Leyte Island. Its capital is Naval. Biliran is one of the country's smallest and newest provinces, being formerly a part (sub-province) of Leyte until achieving full-fledged provincehood in 1992.

During the early Spanish era, what is now called Biliran Island was known as Isla de Panamao. The term refers to an ethnic fishing net. The present name, believed to be adopted sometime between the late 17th century and the early 18th century, was, according to many publications, derived from a native grass called borobiliran which once grew abundantly on the island's plains. A contending theory states that the name came from the word bilir, which was defined in an old Visayan dictionary to be the “corner or edge of a boat, vase or anything protruding, like veins, or the furrow made by the plow.” The dictionary also gives biliran as an alternate spelling for bilir. This theory is supported by the fact that Biliran was site of the first large-scale shipyard, built in the 17th century. Galleons were built to support the Galleon trade between Manila and Acapulco in Mexico.