Anelosimus oritoyacu is a species of tangle-web spider found in Ecuador and Mexico at altitudes from 1,800 to 2,000 metres (5,900 to 6,600 ft).

It has long-lived nest sites, unlike the social spider Anelosimus eximius which has more transitory nest sites, and its webs do not have aerial threads found in other social and sub-social species.

[2] It was first identified as distinct from Anelosimus studiosus in 2006 by Ingi Agnarsson.

It is named for Oritoyacu, Ecuador, where the type specimen was collected.

[2] Elevation appears to play a role in sociality within the Anelosimus genus, so the high elevation has been implicated as potentially explanatory of the unusually low sex ratio and other peculiarities of this species.