The term Deletion may have the following specialized meanings:

• File deletion, a way of removing a file from a computer’s file system
• Deletion (genetics), deletion of a gene or chromosome segment, symbolized in the literature by a Δ symbol
• Deletion (music industry), a term for removing a record from a label’s catalog
• Deletion (linguistics), a phonological process that allows for the elimination of a segment

Delete may refer to:

• Delete key, a key on modern computer keyboards which erases text
• Delete (SQL), Delete for SQL
• DEL, the delete control code in the C0 and C1 control codes
• delete, a built-in operator in the [[C++]] programming language.