Pachybolidae, is a family of Round-backed millipedes of the order Spirobolida. The family includes 49 different genera. Two subfamilies recognized.

- Pachybolinae - Spiromiminae

- Alluviobolus - Aphistogoniulus - ?Atlanticobolus - Atopochetus - Aulacobolus - Brachyspirobolus - ?Bukobolus - ?Callipodolus - Caprobolus - Centrobolus - Colossobolus - Corallobolus - Crurifarcimen - ?Dactylobolus - Dekanbolus - ?Diaphoropus - Dichromatobolus - Epibolus - Epitrigoniulus - Erythroprosopon - Eucentrobolus - Flagellobolus - Gabolus - Granitobolus - Hadrobolus - Hyperbolus - Komphobolus - Litostrophus - Madabolus - Metiche - Microbolus - ?Microspirobolus - Mystalides - Neptunobolus - Ostinobolus - Pachybolus - Parabolus - Pelmatojulus - Pseudocentrobolus - Riotintobolus - Sanguinobolus - ?Spiromanes - Spiromimus - Stenobolus - Titsonobolus - Tonkinbolus - Trachelomegalus - Xenobolus - Zehntnerobolus