Discosoma (or Actinodiscus) is a genus of soft mushroom coral native to the Indian Ocean. This genus is sometimes incorrectly referred to as mushroom anemone or disc anemone. This coral is commonly collected and used worldwide in marine aquariums, where it is known to grow easily.

There are 5 known species of mushroom coral: Actinodiscus dawydoffi, Actinodiscus fungiformis, Discosoma nummiforme, Actinodiscus rubraoris, and Actinodiscus unguja.