Diadema
# Diadema

Diadema is the term for diadem in most Romance languages, and in English may refer to:

* Diadema, São Paulo, a city in São Paulo state, Brazil
* Diadema (sea urchin), a genus of sea urchin belonging to the family Diadematidae
* Diadema (fungus), a genus of fungi in the family Diademaceae
* Damon diadema, a species of arachnid, sometimes known as the tailless whip scorpion
* Sinea diadema, a species of the assassin bug family, native to North America
