Thoa may refer to:
* ''Thoa'', a synonym for a genus of gymnosperms, ''
Gnetum
''Gnetum'' is a genus of gymnosperms, the sole genus in the family Gnetaceae within the Gnetophyta. They are tropical evergreen trees, shrubs and lianas. Unlike other gymnosperms, they possess vessel elements in the xylem. Some species have been ...
''
* ''Thoa'', a synonym for a genus of hydrozoans, ''
Halecium''
{{Genus disambiguation