The Minor Basilica of Saint Michael the Archangel, commonly known as Tayabas Basilica, is a Roman Catholic basilica located in Tayabas, Quezon, Philippines, under the Diocese of Lucena. Its titular saint is Michael the Archangel, whose feast is celebrated every September 29.

The basilica is the largest in the province of Quezon; built in the shape of a key, it has the local moniker "Susì ng Tayabas" ("Key of Tayabas"). The church's 103-metre (338-foot) aisle is also one of the longest naves among the country’s Spanish colonial era churches.

Catholic presence of Tayabas was established in 1578 by Franciscan priests Juán Portocarrero de Plasencia and Diego de Oropesa de San José, known as the "Apostles of Laguna and Tayabas". In 1580, the town of Tayabas was established as a parish with Michael the Archangel as its patron saint. Like most churches in the Philippines during the Spanish colonial era, the first church was a camarin-type structure of bamboo, nipa and anahaw built between 1580 and 1585 under the Franciscan friars.

The church was repaired under the supervision of Saint Pedro Bautista in 1590. In the same year, the Catholic Church obtained permission from the Superior government to build the church using stone. Upon the order of Saint Pedro Bautista, leader of the Franciscans, the church was rebuilt in 1600 using bricks; this building was later destroyed by earthquake in 1743 earthquake, leaving only the walls standing. Due to the growing number of Catholics in Tayabas, the church was again rebuilt and extended. It was further expanded under the term of Benito de la Pila between 1856 and 1866 with the addition of the transept in the shape of a rotunda and cupola. The brick tile roof was replaced with galvanized iron sheets in 1894.

Manuel Gonzáles bought the administration building (casa administración) used by the provincial head of the Franciscans for 962 pesos in 1855. He donated it to the town to be used as classrooms to replace the old, ruined rooms. Gonzáles ordered the school's construction in 1878, using stone, lime and tiled roofing. Together with Samuel Mena, Gonzáles restored the old Tribunal built by Governor La O, which had been unused since it had burnt down in 1877. From 1896 to 1899, Isabelo Martínez was the first native Filipino priest assigned to Tayabas Basilica, followed by Amando Alandy, a native of the town, from 1899 to 1900.

The church's patio played a significant role during the struggle of the Filipino revolutionaries against Spain. General Vicente Lukban and his troops surrendered to the Spanish army on the patio on August 13, 1898, while the Philippine flag was waved from the church's belfry. During the Second World War, the church's convento was used as a garrison by the occupying Japanese Imperial Army.

The church was rededicated on March 14, 1987, by Rubén T. Profugo, Bishop of Lucena. On October 18, 1988, the church was raised to the rank of Minor Basilica by Pope John Paul II through the Congregation for Divine Worship and the Discipline of the Sacraments, and was proclaimed during Mass on January 21, 1989.

Tayabas Basilica is considered to be one of the most beautiful churches in the Philippines. Through Presidential Decree No. 374, the National Museum of the Philippines declared Tayabas Basilica a National Cultural Treasure on July 31, 2001, along with 25 other churches nationwide.

The church at Tayabas is generally considered to be Baroque architecture. It is included in a list of more than 30 churches declared National Cultural Treasures by the National Museum of the Philippines.

The influence of Chinese architecture in Tayabas is pronounced in the design of the basilica. Stone lions in front of the building show a link to the presence of Chinese traders before the Spanish colonial era. Cherubs in stone relief playing the lute, trombone, drum and trumpet can be seen. Its unusual, three-storey façade is almost eclectic, and was added during renovations to the church. The levels are separated by horizontal bands and images of angels and saints including Saint Francis of Assisi, Saint Dominic and Saint Diego of Alcalá. The bottom level of the façade is marked by the main doors flanked by two niches in Mudejar style, as well as the stone lions. The second level has the side and central windows of the choir loft, with sashes made with capiz shells. The topmost tier has stones statues of the Biblical archangels Michael, Gabriel and Raphael.

Tayabas Basilica has a unique floor plan that resembles a key. Because of this, the basilica is often referred to by locals as "Susì ng Tayabas" ("Key of Tayabas")