Sardinal is a district of the Carrillo canton, in the Guanacaste province of Costa Rica.
Sardinal has an area of and an elevation of .
Administrative center of the district is the town of Sardinal.
Other villages in the district are Artola, Cacique, Coco, Guacamaya, Huaquitas, Libertad, Matapalo, Nancital, Nuevo Colón, Obandito, Ocotal, Pilas, Playa Hermosa, Playones, San Blas, Santa Rita and Zapotal.
For the 2011 census, Sardinal had a population of inhabitants.
The district is covered by the following road routes: