Agdangan, officially the Municipality of Agdangan (Tagalog: Bayan ng Agdangan), is a municipality in the province of Quezon, Philippines. According to the 2020 census, it has a population of 12,764 people.

Agdangan is 48 kilometres (30 mi) from Lucena and 178 kilometres (111 mi) from Manila.

This place got its name from the word hagdanan, a Tagalog word for stairs. It was a former barrio of the nearby town Unisan of the then Tayabas province.

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In the 18th and 19th centuries, during the Spanish Colonial era, the Atimonan was suffering from frequent attacks by Pirates and outlaws. A man from this place named Mariano Aguilar thought of moving to a safer place to live and dwell with his family. He asked a good friend and distant relative, Juan Salvador to help him find a nearby peaceful place to settle for good. Along with their immediate families, they walked through the forest south-west bound until they found a clean river. While traversing the riverside, they found a scenic body of water which was best described as ladder-like as the waters run over ladder-like steps. They initially named the place Hagdan-hagdan (ladder-like structure). This majestic scenery nowadays is a local tourist attraction that can be found in Barangay Dayap. As they moved further west, they found a huge, serene and attractive flat land area where they later established the town proper. In this land, they built houses for their families and divided the land area between their family members, relatives and friends. The population in this newly discovered area had increased dramatically and before the end of the 19th century.

As time went by, the two families realized that there was a pressing need to build church, school buildings, marketplace, the government building and other facilities basic to the community. The Salvador family donated the site for the school buildings and the public cemetery while Aguilar family donated the sites for the Roman Catholic Church, the marketplace and the municipal building. The population had increased further as a result of influx of people from nearby municipalities and provinces adjacent to Tayabas (now Quezon province). The Philippine National Railways established a permanent train station which also contributed to the migration of people to this place.

The Aguilar and Salvador families, along with other migrant families such as Garin, Banal, Mapaye, Trinidad and Urgino with the help of local civic organization led by Mr. Pedro Olase, again took proactive efforts to gain independence from Unisan. Their actions led to the foundation of the municipality of Agdangan, Province of Tayabas. The culmination of this endeavor happened on April 1, 1939, when President Manuel L. Quezon signed Executive Order No. 185, creating the municipality of Agdangan. It consisted of the barrios of Agdangan, Binagbag, Calutan, Dayap, Ibabang Kinagunau, Ilayang Kinagunan, Maligaya, and Sildura, all former parts of the town of Unisan. As of today, April 1 has been commemorated in honor of the town's foundation day and is commonly known as Agdangan Day.

In that year, President Quezon appointed Roque M. Aguilar, the eldest son of Mariano Aguilar, as Mayor until the first election was held the following year, where his youngest brother Catalino Aguilar was elected Mayor along with Crispin Salvador as Vice Mayor.

Through the years, without any lucrative source of income and industries, the modern-day Agdangan has already improved in terms of infrastructure. The local revenue has grown fairly well. The resilience, diligence, peacefulness and simplicity of people of Agdangan have been the key factors of its success.

Agdangan is politically subdivided into 12 barangays. Each barangay consists of puroks and some have sitios.

Population census of Agdangan

Year	Pop.	±% p.a.
1948	3,898	—
1960	5,410	+2.77%
1970	7,235	+2.95%
1975	7,163	−0.20%
1980	7,389	+0.62%
1990	8,207	+1.06%
1995	9,025	+1.80%
2000	9,946	+2.10%
2007	11,164	+1.61%
2010	11,567	+1.30%
2015	12,851	+2.03%
2020	12,764	−0.13%
Source: Philippine Statistics Authority

Poverty incidence of Agdangan

10 20 30 40 50 2006 41.90 2009 19.79 2012 21.63 2015 15.21 2018 14.00 2021 25.50 Source: Philippine Statistics Authority

The municipality is connected with Manila by the Pan-Philippine Highway and daily rail services to and from Naga & Legazpi are provided by the Philippine National Railways.

In order to spur development in the municipality, The Toll Regulatory Board declared Toll Road 5 the extension of South Luzon Expressway. A 420-kilometer, four lane expressway starting from the terminal point of the now under construction SLEX Toll Road 4 at Barangay Mayao, Lucena City in Quezon to Matnog, Sorsogon, near the Matnog Ferry Terminal. On August 25, 2020, San Miguel Corporation announced that they will invest the project which will reduce travel time from Lucena to Matnog from 9 hours to 5.5 hours.

On June 3, 2022, the Department of Transportation and San Miguel Corporation signed a Supplemental Toll Operations Agreement (STOA) for SLEX Toll Road 5 which was approved by then President Rodrigo Duterte 24 days later. Segment 1 of TR5 will pass through the municipality.

• Roque Marasigan Aguilar
• Catalino Zatarain Aguilar
• Crispin Salvador
• Pedro Salvador Francia
• Gregorio Valle
• Norberto Monterey
• Jose Isaac Lim
• Carmelito Cabana Legaspi
• Augusto Regencia Pobeda
• Rhadam P. Aguilar
• Vicenta Aguilar
• Rhadam P. Aguilar

• Agdangan Profile at PhilAtlas.com
• Philippine Standard Geographic Code
• Philippine Census Information