''Polybranchia'' may refer to:
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''Polybranchia'' (polychaete), genus of polychaetes in the family
Spionidae
Spionidae is a family of marine worms within the Polychaeta. Spionids are selective deposit feeders that use their two grooved palps
Pedipalps (commonly shortened to palps or palpi) are the second pair of appendages of chelicerates – a grou ...
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''Polybranchia'' (gastropod), genus of sea slugs in the family Caliphyllidae
{{Taxonomy disambiguation