Phyllocnistis longipalpa is a moth of the family Gracillariidae.

Adults have been recorded in April in southern Florida.

The mine has the form of a long, slender, serpentine gallery, containing a dark, narrow, median frass trail, present on the underside of the leaf, with pupation occurring in a slightly enlarged, elliptical chamber at the mine terminus along the leaf edge.

The specific name is derived from the Latin longus (meaning long) and palpus (meaning feeler), in reference to the elongate labial palpi, which are diagnostic for this species.

This article relating to moths in genus Phyllocnistis is a stub.