Seta , plural: setae , is a biological term derived from the Latin word for "bristle". It refers to a number of different bristle- or hair-like structures on living organisms.

Seta is a bristle in plants and animals.

Seta (, also Σέττα - Setta) is a mountain village and a community in the northern part of the municipal unit of Amarynthos, on the island of Euboea, Greece. In 2001 its population was 147 for the village and 201 for the community, which includes the village Kato Seta. It is situated in the mountainous interior of Euboea, northeast of the mountain Olympus and southeast of Dirfi, the highest mountain of the island. It is 10 km south of Stropones, 16 km north of Amarynthos and 30 km east of Chalcis. Seta suffered damage from the 2007 Greek forest fires.