Administrator

• Administration, the performance or management of business operations
• Administrator of the Government, in various Commonwealth realms and territories
• Administrator (law), a person appointed by a court to handle the administration of an estate for someone who has died without a will.
• In the independent agencies of the United States government, the highest executive officer in an independent agency whose name ends with the word "administration"
• Academic administration, administration of a school

In computing:

• Database administrator, a person who is responsible for the environmental aspects of a database
• Forum administrator, one who oversees discussions on an Internet forum
• Network administrator, engineers involved in computer networks
• Server administrator, a person who acts as the administrator for an Internet gaming or other type of server.
• System administrator, a person responsible for running technically advanced information systems