The Webmaster, also called the system administrator, the author, or the website administrator, is the person responsible for designing, developing, marketing, or maintaining a website.

Webmasters are practitioners of web communication. Typically, they are generalists with HTML expertise who manage all aspects of Web operations. On a smaller site, the webmaster will typically be the owner, developer and/or programmer, in addition to the author of the content.

On larger sites, the webmaster will act as a coordinator and overseer to the activities of other people working on the site and is usually an employee of the owner of the Web site, hence webmaster can also be listed as an occupation. If the webmaster is hired by a larger Web site, or promoted to the position, they could do things from web design, to project management, or employee supervision. The range of activities to be undertaken by a webmaster may be estimated using the concept of Website scale.