Community Expansion Pack (CEP), a collection of user-created content for the computer game Neverwinter Nights

Código de Endereçamento Postal, the term for postal code in Portugal and several former Portuguese colonies

Cepheus (constellation) (Cep), standard astronomical abbreviation

Complex Event Processing

Clean Energy Partnership, a joint hydrogen-project in Europe.

Circular Error Probability or Circular Error Probable (CEP), in ballistics, a measure of a weapon system's precision

Campaign for an English Parliament (CEP): a pressure group seeking the re-establishment of a devolved English parliament

Boletus edulis, also known as Porcini or cep, an edible mushroom

Cep, a Czech village near Jindřichův Hradec (cep means flail in Czech)

Communications, Energy and Paperworkers Union of Canada, a Canadian trade union.