Modulidae, common name modulids, is a family of small sea snails, marine gastropod molluscs in the superfamily Cerithioidea.

Conomodulus is a small genus of sea snails representing one extinct and one extant species. This genus of snails was first formally named in 2014 by Bernard Landau, Geerat J. Vermeij, and Sonja Reich. The name Conomodulus refers to the conical spire and familial name, Modulidae.
Indomodulus tectum is a species of small sea snail, a marine gastropod mollusk in the family Modulidae.

Modulus is a genus of small sea snails, marine gastropod molluscs in the family Modulidae.

Trochomodulus carchedonius is a species of small sea snail, a marine gastropod mollusk in the family Modulidae.

Modulus modulus is a species of small sea snail, a marine gastropod mollusk in the family Modulidae.

Modulus turbinoides is a species of sea snail, a marine gastropod mollusk in the family Modulidae.
Trochomodulus is a genus of small sea snails, marine gastropod molluscs in the family Modulidae.