Microtheca can mean:
*
''Microtheca'' (beetle), a genus of leaf beetles
*
''Microtheca'' (mollusc), a synonym of the gastropod mollusc genus ''
Microthyca''
*
''Microtheca'' (alga), a genus of
diatom
A diatom (Neo-Latin ''diatoma'') is any member of a large group comprising several Genus, genera of algae, specifically microalgae, found in the oceans, waterways and soils of the world. Living diatoms make up a significant portion of Earth's B ...
s.
*
''Microtheca'' (plant), a synonym for the orchid genus ''
Cynorkis''
{{Genus disambiguation