De orde Chlamydomonadales F.E.Fritsch kent 28 families.
| Actinochloridaceae Korshikov | Dunaliellaceae T.Christensen | Protosiphonaceae Blackman & Tansley |
| Asteromonadaceae Péterfi | Gloeodendraceae Korshikov | Raciborskiellaceae Korshikov |
| Carteriaceae Pascher | Goniaceae (Pascher) Pascher | Sphaerocystidaceae Fott ex Tsarenko |
| Characiochloridaceae Skuja | Haematococcaceae G.M.Smith | Sphaerodictyaceae C.-C. Jao |
| Chlamydomonadaceae F.Stein | Hormotilaceae Korshikov | Spondylomoraceae Korshikov |
| Characiosiphonaceae Iyengar | Hypnomonadaceae Korshikov | Tetrabaenaceae H.Nozaki & M.Ito |
| Chlorangiellaceae Bourrelly ex Fott | Palmellaceae Decaisne | Tetrasporaceae Wittrock |
| Chlorochytriaceae Setchell & N.L.Gardner | Palmellopsidaceae Korshikov | Volvocaceae Ehrenberg |
| Chlorococcaceae Blackman & Tansley | Phacotaceae Francé | |
| Chlorosarcinaceae Bourrelly ex Groover & Bold | Pleurastraceae K.R.Mattox & K.D.Stewart |
