Alias may refer to:
- Pseudonym, a fictitious name that a person or group assumes for a particular purpose
- Pen name, a pseudonym adopted by an author and printed on the title page or by-line of their works in place of their real name
- Stage name, a pseudonym used by performers and entertainers
- Nickname, a substitute for the proper name of a familiar person, place or thing
- Code name, a code word or name used, sometimes clandestinely, to refer to another name, word, project, or person