Tinajo is a municipality in the western part of the island of Lanzarote in the Province of Las Palmas in the Canary Islands, Spain. The population is 5,783 (2013), and the area is 135.28 km². It is located near the north coast, northwest of the island capital Arrecife. The main town in the municipality is Tinajo.
The Timanfaya National Park (created in 1974) covers the southwestern part of the municipality and is where most of its mountains are located. The park features volcanic mountains and rugged lands. The rest of the park is in Yaiza municipality.