The Ecuadorian–Peruvian territorial dispute was a territorial dispute between Ecuador and Peru, which, until 1928, also included Colombia. The dispute had its origins on each country's interpretation of what Real Cedulas Spain used to precisely define its colonial territories in the Americas. After independence, all of Spain's colonial territories signed and agreed to proclaim their limits in the basis of the principle of uti possidetis juris, which regarded the Spanish borders of 1810 as the borders of the new republics. However, conflicting claims and disagreements between the newly formed countries eventually escalated to the point of armed conflicts on several occasions.

The Second Ecuadorian–Peruvian War, known locally as the War of '41, was a South American border war fought between 5–31 July 1941. It was the first of three military conflicts between Ecuador and Peru during the 20th century.