DES or Des may refer to:

• Data Encryption Standard, an encryption algorithm
• DirectShow Editing Services, an Application Programming Interface
• Discrete event simulation, a kind of scientific modelling

DEJ may stand for:

• dental-enamel junction, in dentistry
• Deferred Entry of Judgement, in law

Dej (; ; ; ) is a city in northwestern Romania, 60 km north of Cluj-Napoca, in Cluj County. It lies where the Somesul Mic River meets the river Somesul Mare River. The city administers four villages: Ocna Dejului (Désakna), Pestera (Pestes), Pintic (Oláhpéntek) and Somcutu Mic (Kissomkút).

Delta Epsilon Sigma (ΔΕΣ) is a national scholastic honor society that was established in 1939 for students of Catholic universities and colleges in the United States. The society was founded at Loras College in Dubuque, Iowa in 1939 by Father Fitzgerald. Requirements for membership are as follows. Undergraduate students must be ranked in the top twenty percent of their class; graduate students must have a minimum GPA of 3.5 on a 4.0 scale. These excellent statistics alone do not assure membership; candidates must also have a record of dedication to intellectual activity and community service.