Dipogon sayi is a species of spider wasp of the family Pompilidae.

[2][3] This species is found in woods, where it searches stems, twigs, logs, trunks, and branches for nest sites.

[2] This species nests in preexisting cavities, namely those in trees.

Prey includes most of the common species of spiders.

D. sayi rarely visits flowers, though it is recorded on Queen Anne's Lace (Daucus carota).