The Maranon spinetail[note 1][2] (Synallaxis maranonica) is a Critically Endangered species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae.

[5][6] The Maranon spinetail is found in the valley of the Marañón River from far southeastern Ecuador's Zamora-Chinchipe Province south into the northern parts of Peru's departments of Cajamarca and Amazonas.

[6] The IUCN originally assessed the Maranon spinetail as Vulnerable but since 2012 has rated it Critically Endangered.

"Much of its woodland habitat has progressively deteriorated owing to widespread and long-term cultivation of land within the Marañón drainage.

The spread of oil-palm plantations, cattle-ranching and logging all seriously threaten its remaining habitat, with oil extraction a potential future problem.

"[1] It is considered uncommon in Ecuador and locally fairly common in Peru, but because it is difficult to see it may be overlooked.