Toledonia is a genus of sea snails, marine gastropod molluscs in the family Cylichnidae.

Toledonia was originally described by American malacologist William Healey Dall in 1902.

[1] Dall's original text (the type description) reads as follows: TOLEDONIA, new genus.

Shell small, smooth, thin, imperforate, succineæform; pillar continuous with the basal margin of the aperture, straight, but with an elevated thin plait near the base of the pillar, which appears to be continued into the coil of the shell; nucleus smooth, dextral; soft parts unknown.

As it was dredged at a considerable depth there seems no reason to doubt it is normally marine.Species within the genus Toledonia include: This article incorporates public domain text from the reference.