Genus-group taxon name Polysiphonia may refer to:
- In Regnum Plantae:
- Polysiphonia Greville , 1823 (Rhodophyta:Rhodomelaceae): Accepted senior homonym
- In Regnum Animalia:
- Polysiphonia Pomel, 1872 (Porifera:Chalinidae): Accepted senior homonym, junior synonym of Haliclona Grant, 1836
- Polysiphonia Hertwig, 1882 (Anthozoa:Exocoelactiidae): Junior homonym, replaced by Exocoelactus Carlgren, 1925
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