Quezon, officially the Province of 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.

Calabarzon, sometimes referred to as Southern Tagalog and designated as Region IV‑A, is an administrative region in the Philippines. The region comprises five provinces: Batangas, Cavite, Laguna, Quezon, and Rizal; and one highly urbanized city, Lucena. It is the most populous region in the Philippines according to the Philippine Statistics Authority (PSA), having over 16.1 million inhabitants in 2020, and is also the country's second most densely populated after the National Capital Region. It is situated southeast of Metro Manila, and is bordered by Manila Bay and South China Sea to the west, Lamon Bay and the Bicol Region to the east, Tayabas Bay and the Sibuyan Sea to the south, and Central Luzon to the north. It is home to places like Mount Makiling near Los Baños, Laguna, and Taal Volcano in Batangas.