Pastaza (Spanish pronunciation: [pasˈtasa]) is a province in the Oriente of Ecuador located in the eastern jungle.

The Pastaza River surges into the province from the west and as the landscape flattens, meanders on to the Napo, a tributary of the Amazon.

Natural resources of Pastaza are bananas, grapefruit, tobacco, cocoa and coffee.

Some of the snakes blend extremely well even in trees, so walking sticks and/or machetes are a good precaution for hiking.

The following table lists each with its population at the 2001 census, its area in square kilometres (km2), and the name of the canton seat or capital.