This is a taxonomy of the Kingdom Rhodophytae. In general this follows the system of Saunders and Hommersand (2004) in which the group has two phyla, Rhodophyta and Cyanidiophyta. I have added the Glaucophyta as a group incertae sedis.

TAXON	ENDING
PHYLUM	-OPHYTA
CLASS	-PHYCEAE
ORDER	-ALES

PHYLUM RHODOPHYTA

• SUBPHYLUM RHODELLOPHYTINA
  • CLASS RHODELLOPHYCEAE
    • ORDER RHODELLIALES (Called Porphyridiales 1 in Saunders and Hommersand, 2004).
      • Rhodella, Dixoniella, Glaucosphaera.
    • ORDER STYLONEMATALES (Called Porphyridiales 2 in Saunders and Hommersand, 2004).
      • Stylonema, Bangiopsis, Chroodactylon, Chroothece, Goniotrichopsis, Rhodosorus.
    • ORDER PORPHYRIDIALES (Called Porphyridiales 3 in Saunders and Hommersand, 2004).
      • Porphyridium, Flintiella.

• SUBPHYLUM METARHODOPHYTINA
  • CLASS COMSPOPOGONOPHYCEAE
    • ORDER COMPSOPOGONALES
      • Compsopogon, Compsopogonopsis, Boldia [BOLDIACEAE; COMPSOPOGONACEAE].
    • ORDER ERTHROPELTIDALES
      • Erythrotrichopeltis, Smithora, Erythrotrichia, Erythrocladia, Erythropeltis, Erythrotrichia, Porphyropsis. [ERYTHROTRICHIACEAE].
    • ORDER RHODOCHAETALES
      • Rhodochaete. [RHODOCHAETACEAE].

• SUBPHYLUM EURHOPHYTINA
  • CLASS BANGIOPHYCEAE
    • ORDER BANGIALES
      • Bangia, Porphyra, Porphyrella.
  • CLASS FLORIDEOPHYCEAE
    • SUBCLASS HILDENBRANDIOPHYCIDAE
      • ORDER HILDENBRANDIALES
        • Hildenbrandia.
    • SUBCLASS NEMALIOPHYCIDAE
      • ORDER NEMALIALES
        • Nemalion, Liagora, Pseudogloiophloea, Galaxaura, Kylinia, Cumagloia.
      • ORDER ACROCHAETIALES
        • Acrochaetium, Audouinella, Rhodochorton, Yamadaella.
      • ORDER BALBIANIALES
        • Balbiana.
      • ORDER BALLIALES
        • Ballia.
      • ORDER BATRACHOSPERMALES
        • Batrachospermum, Lemanea, Sirodotia.
      • ORDER COLACONEMATALES
        • Colaconema.
      • ORDER CORALLINALES
        • Corallina, Bossiella, Calliathron, Choreonema, Jania, Lithoporella, Lithothamnium, Lithothrix, Phymatolithon, Porolithon, Sporolithon, Kvaleya, Amphiroa, Melobesia, Clathromorphum.
      • ORDER PALMERIALES
        • Palmaria, Halosaccion, Rhodophysema. Camontagnea.
      • ORDER RHODOGORGONALES
        • Rhodogorgon, Renouxia.
      • ORDER THOREALES
        • Thorea.
    • SUBCLASS AHNFELDTOPHYCIDAE
      • ORDER AHNFELTIALES
        • Ahnfeltia, Gymnogongrus, Phyllophora, Stenogramme.
      • ORDER PIHIELLALES
        • Pihiella.
    • SUBCLASS RHODYMENIOPHYCIDAE
      • ORDER RHODYMENIALES
        • Rhodymenia, Botryocladia, Chrysymenia, Coelarthrum, Coelothrix, Fauchia, Halosaccion, Champia, Chylocladia, Coeloseira, Gasstroclonium, Lomentaria.
      • ORDER BONNEMAISONIALES
        • Asparagopsis, Bonnemaisonia, Delisia, Ptilonia.
      • ORDER CERAMIALES
        • Ceramium, Aristothamnion, Bornetia, Compsothamnion, Corynospora, Crouania, Dohrniella, Ptilota, Griffithsia, Pleonosporium, Plumaria, Ptilothamniopsis, Seirospora, Spermothamnion, Tiffaniella, Callithamnion, Antithamnion, Bostrychia, Chondria, Colacopsis, Lenormandia, Heterosiphonia, Dasya, Platysiphonia, Membranoptera, Delesseria, Caloglossa, Phycodrys, Polyneura, Polysiphonia, Petrosiphonia, Amplisiphonia, Rhodomela, Rytiphlaea, Vidalia, Laurencia, Cryptopleura, Hemineura, Hypoglossum, Martensia, Nitophyllum, Rhodoptilum.
      • ORDER GELIDIALES
        • Gelidium, Pterocladia, Suhria.
      • ORDER GIGARTINALES
        • Gigartina, Acrosymphyton, Dumontia, Mastocarpus, Chondrus, Iridaea, Phyllophora, Gymnogongrus, Cruoria, Cruoriopsis, Pterocoelis, Bertholdia, Furcellaria, Halarachnion, Neurocaulon, Rhodophyllis, Cystoclonium, Calliblepharis, Polyides, Besa, Neoardhiella, Opuntiella, Euchemia, Gracilaria, Gracilariophila.
      • ORDER GRACILARIALES
        • Gracilaria, Gracilariopsis, Gracilariophila, Hydropuntia.
      • ORDER HALYMENIALES
        • Cryptonemia, Grateloupia, Halymenia, Lobocolax, Pachymeniopsis, Prionitis, Sebdenia.
      • ORDER NEMASTOMATALES
        • Nemastoma, Platoma, Schizymenia.
      • ORDER PLOCAMIALES
        • Pliocamium, Pseudoanemonia, Sarcodia.
      • ORDER RHODYMENIALES
        • Champia, Fauchea, Lomentaria, Rhodymenia.

PHYLUM CYANIDIOPHYTA

• CLASS CYANIDIOPHYCEAE
  • ORDER CYANIDIALES
    • Cyanidium, Cyanidioschyzon, Galdieria.

INCERTAE SEDIS:

PHYLUM GLAUCOPHYTA

• CLASS GLAUCOCYSTOPHYCEAE
  • ORDER GLAUCOSYSTIDALES
    • Glaucocystis, Cyanophora, Gloeochaete, Glaucosphaera.