Kayapa, officially the Municipality of Kayapa (Gaddang: Ili na Kayapa; Ilocano: Ili ti Kayapa; Tagalog: Bayan ng Kayapa), is a 3rd class municipality in the province of Nueva Vizcaya, Philippines. According to the 2020 census, it has a population of 26,469 people.

Kayapa is 61 kilometres (38 mi) from Bayombong, 266 kilometres (165 mi) from Manila, and 78 kilometres (48 mi) from Baguio.

In 1754, Governor-General Pedro Manuel de Arandía Santisteban sent Comandante Dovilla, who was based in Pangasinan, to establish a civil government and spread Christianity among the non-Christian Tribes. The mission first saw the Valley of Yapa (Yapa meaning bountiful) which was inhabited by the Allagots, the second descendants of the Bormangi and Owak, and the third descendants of the Kalanguya, Ibaloi, Ilo-o, and Karao tribes who settled in the fertile valley. When the comandante (commander) and his company arrived in the valley of Yapa, the villagers entertained them under a big tree called “Kalabao”, which stood in the middle of the valley. It was from these words “Kalabao” and “Yapa” where the present name “Kayapa” was coined, the old name of the present town proper having been Dangatan. Prior to that, Kayapa was subjected to previous attempts at Spanish colonization as early as 1591. However, colonization efforts did not prosper due to ferocious resistance by the natives. In 1891, as part of a comprehensive plan to subdue the tribes of the Cordilleras, Governor-General Valeriano Weyler established the Comandancia Politico-Militar of Kayapa, which covered what would become the entire municipality, and placed a permanent military garrison there, which existed until their withdrawal during the Philippine Revolution.

In 1901, the American colonial authorities placed Kayapa under the jurisdiction of the province of Benguet and later, in 1908, as part of Mountain Province when Benguet was downgraded into a constituent sub-province. On January 29, 1915, Governor-General Francis Burton Harrison issued Executive Order No. 9, transferring all territories of the former Spanish Commandancia of Kayapa, except the area which lies within the Benguet watershed of the Agno River, from the sub-Province of Benguet to the Province of Nueva Vizcaya. On November 11, 1950, President Elpidio Quirino signed Executive Order No. 368, proclaiming the Municipality of Kayapa as a regular town, thus, merging Kayapa and the settlement of Pingkian into one town as it is today.

Kayapa is politically subdivided into 30 barangays. Each barangay consists of puroks and some have sitios.

Population census of Kayapa

Year Pop. ±% p.a. 1918 7,577 —     1939 8,702 +0.66% 1948 5,759 −4.48% 1960 9,298 +4.07% 1970 14,920 +4.84% 1975 20,718 +6.81% 1980 20,491 −0.22%	Year Pop. ±% p.a. 1990 18,685 −0.92% 1995 19,376 +0.68% 2000 19,193 −0.20% 2007 20,806 +1.12% 2010 21,453 +1.12% 2015 23,714 +1.93% 2020 26,469 +2.18%
Source: Philippine Statistics Authority

Poverty incidence of Kayapa

10 20 30 40 2006 15.80 2009 16.11 2012 32.92 2015 21.05 2018 29.15 2021 20.92 Source: Philippine Statistics Authority

Kayapa, belonging to the lone congressional district of the province of Nueva Vizcaya, is governed by a mayor designated as its local chief executive and by a municipal council as its legislative body in accordance with the Local Government Code. The mayor, vice mayor, and the councilors are elected directly by the people through an election which is being held every three years.

Members of the Municipal Council
(2019–2022)

Position	Name
Congressman	Luisa L. Cuaresma
Mayor	Elizabeth D. Balasya
Vice-Mayor	Peter L. Bay-an
Councilors	Adriano A. Dodon
	Oscar B. Campoy
	Esteban A. Baccac
	Romeo M. Camlas, Jr.
	Valdez A. Duntogan
	Tony B. Pagnas
	Pacito P. Cadame
	Tony P. Wakit, Sr.

The Schools Division of Nueva Vizcaya governs the town's public education system. The division office is a field office of the DepEd in Cagayan Valley region. The office governs the public and private elementary and public and private high schools throughout the municipality.

• 
  Downtown area
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  Public market
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  Kayapa Central School
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  Saint Joseph Parish Church
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  Town proper
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  Variant of flag used at parades

• Media related to Kayapa at Wikimedia Commons
• Philippine Standard Geographic Code
• Philippine Census Information
• Local Governance Performance Management System Archived 2016-03-04 at the Wayback Machine