Quezon, officially the Province of Quezon (Tagalog: Lalawigan ng Quezon) and historically known as Tayabas, is a province in the Philippines located in the Calabarzon region on Luzon. Lucena, a highly urbanized city governed separately from the province, serves as the provincial capital and its most populous city. The name of the province came from Manuel L. Quezon, the president of the Philippines from 1935 to 1944. The province was known as Kalilayan upon its creation in 1591, renamed as Tayabas by the 18th century, before settling on its current name in 1946. To distinguish the province from Quezon City, it is also known as Quezon Province, a variation of the province's official name.

One of the largest provinces in the country, Quezon is situated on the southeastern portion of Luzon, with the majority of its territory lying on an isthmus that connects the Bicol Peninsula to the rest of Luzon. It also includes the Polillo Islands in the eastern part of the province. It is bordered by the provinces of Aurora and Bulacan to the north, Rizal, Laguna, and Batangas to the west, and Camarines Norte and Camarines Sur to the southeast. It also shares maritime borders with Marinduque and Masbate.

Archaeological excavations in the province attest to its rich precolonial past. Archaeological materials including burial jars, human bones, shell middens and pot shreds have been discovered at different sites on Bondoc Peninsula including the towns of San Narciso, San Andres, Mulanay and Catanauan. The most recent excavations were conducted in Catanauan by the Catanauan Archeological and Heritage Project.^{[citation needed]}

According to the preliminary report released by the Catanauan Archaeological and Heritage Project, several excavations were conducted in the 1930s. One of the excavations was conducted in San Narciso where archaeologists found burial jars. The site, inspected by Ricardo Galang, resulted in the discovery of burial jars near the coast. Galang also went to San Andres where excavations yielded 14th and 15th century ceramics as well as shell bracelets and beads. According to the journal as well, at a site named Tala, archaeologists discovered a glazed Chinese jar containing bone fragments from the early Ming dynasty. Looking at other archaeological sites located in adjacent areas like Marinduque and Masbate, it can be inferred that these excavations date back to the metal period of the archipelago.

In 2012, at Mt. Kamhantik in the town of Mulanay, 15 limestone coffins were discovered. Carbon dating on a human tooth found it to be at least 1,000 years old. According to archaeologists, the village is proof that the ancient inhabitants of the area practiced a more sophisticated way of life. Metal tools are believed to have been used to carve the coffins, and this is the first of its kind discovered in the archipelago. The remains are said to date back to the 10th to 14th century.

Originally, what now forms Quezon was divided among the provinces of Batangas, Laguna, and Nueva Ecija. However, at different points in time, the boundaries of Quezon changed and included parts of Aurora, Marinduque, and Camarines Norte. At the early period of Spanish colonization, the province of Aurora was called El Principe, Infanta was called Binangonan de Lampon, and southern Quezon was called Kalilayan. The first European to explore the area was Juan de Salcedo in 1571–1572, during his expedition from Laguna to Camarines provinces.

In 1574, Father Diego de Oropesa founded the town of Bumaka, now known as the municipality of Gumaca.

In 1591, through Governor General Gómez Pérez Dasmariñas, the province was created and was called Kaliraya or Kalilayan, after the capital town which later became Unisan.