Quezon,[a] officially the Province of Quezon (Filipino: Lalawigan ng Quezon), is a province in the Philippines located in the Calabarzon region on Luzon. Kalilayan was the first known name of the province upon its creation in 1591. Around the middle of the 18th century, it was changed to Tayabas. In recognition of the second president of the Philippines, Manuel L. Quezon, the name of Tayabas Province is changed to Quezon. Lucena, the provincial capital, the seat of the provincial government, and the most populous city of the province, is governed independently from the province as a highly urbanized city. To distinguish the province from Quezon City, it is sometimes called Quezon Province, a variation of the province's official name.
Quezon is southeast of Metro Manila and is bordered by the provinces of Aurora to the north, Bulacan, Rizal, Laguna and Batangas to the west and the provinces of Camarines Norte and Camarines Sur to the east. Part of Quezon lies on an isthmus connecting the Bicol Peninsula to the main part of Luzon. The province also includes the Polillo Islands in the Philippine Sea. Some marine parts of the Verde Island Passage, the center of the center of world's marine biodiversity, are also in the province.