Dom or DOM may refer to:

• Digital optical monitoring function in SFP transceivers
• Disk-on-a-module, an alternative to traditional computer hard disk drives
• Document Object Model, a way to refer to XML or (X)HTML elements as objects
• Domain Object Model, a model that identifies the relationships among the entities within the scope of a software problem

Anglo-Saxon law (Old English ǣ, later lagu "law"; dōm "decree, judgement") is a body of written rules and customs that were in place during the Anglo-Saxon period in England, before the Norman conquest. This body of law, along with early Scandinavian law and Germanic law, descended from a family of ancient Germanic custom and legal thought. However, Anglo-Saxon law codes are distinct from other early Germanic legal statements - known as the leges barbarorum - in part because they were written in Anglo-Saxon, instead of in Latin. The laws of the Anglo-Saxons were the second in medieval Western Europe after those of the Irish to be expressed in a language other than Latin.