Santa Teresita, officially the Municipality of Santa Teresita (; ; ), is a municipality in the province of Cagayan, Philippines. According to the , it has a population of people.
Santa Teresita is situated from the provincial capital Tuguegarao, and from the country's capital city of Manila.
Santa Teresita is politically subdivided into 13 barangays. Each barangay consists of puroks while some have sitios.
Based on the 2024 census, the population of Santa Teresita was 19,476 people, with a density of .
Bakong (Hanguana malayana) is abundant in Santa Teresita. The aquatic plant grows to three meters and is used to make pulp, yarn, bioplastics, textile, clothing, accessories, furniture and paper handicrafts.
Santa Teresita is part of the first legislative district of the province of Cagayan. It 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 municipal councilors are elected directly by the people through an election held every three years.
The Schools Division of Cagayan governs the town's public education system. The division office is a field office of the DepEd in Cagayan Valley region. The Sta. Teresita Schools District Office governs the public and private elementary and high schools throughout the municipality.