Philippines's 5th senatorial district, officially the Fifth Senatorial District of the Philippine Islands (Spanish: Quinto Distrito Senatorial de las Islas Filipinas), was one of the twelve senatorial districts of the Philippines in existence between 1916 and 1935. It elected two members to the Senate of the Philippines, the upper chamber of the bicameral Philippine Legislature under the Insular Government of the Philippine Islands for each of the 4th to 10th legislatures. The district was created under the 1916 Jones Law from the southern Luzon provinces of Batangas, Cavite, Mindoro and Tayabas. Marinduque was added in 1920 upon its re-establishment as a regular province separate from Tayabas.