Polyrhachis gracilior is a species of ant found in the southwest and northeast India.

It is one of the few ants that build arboreal nests[1] made of leaves stitched together using silk produced by their larvae.

Originally described as a "race" of Polyrhachis furcata, it was elevated to a full species by C T Bingham who noted differences in the shape of the spines.

[2] A species described from Travancore as weberi by Horace Donisthorpe in 1943, was identified as being identical to gracilior by Barry Bolton.

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