{{#invoke:Side box|main}} Domain may refer to:

• Domain (biology), a taxonomic subdivision larger than a kingdom
• Domain name, the name of a realm of administrative autonomy, authority, or control on the Internet
• Magnetic domain, a region within a magnetic material which has uniform magnetization
• Protein domain, a part of a protein that can exist independently of the rest of the protein chain
• Territory (subdivision), a non-sovereign geographic area which has come under the authority of another government
• Domain Group One of the two major real estate marketing portals in Australia