Administrator (sometimes abbreviated admin) may refer to:
- Administrator (business), a person for the performance or management of administrative business operations
- Administrator of the Government, in various Commonwealth realms and territories
- Administrator (Australia), for use of this title in Australia
- In the independent agencies of the United States government, the highest executive officer in an independent agency whose name ends with the word "administration"
- Administrator (law), a person appointed by a court to handle the administration of an estate for someone who has died without a will
- Administration (law), a procedure under the insolvency laws of a number of common law jurisdictions
- Academic administration, administration of a school
- Administrator (role), one of the roles in the Keirsey Temperament Sorter personality assessment scheme
- Administrator (comics), a fictional character in the Marvel Universe
- Administr@tor, an education magazine published by Scholastic
- Arts administrator, responsible for the business end of an arts organization
- Administrator, a practitioner of public administration