Sub or SUB may refer to:

Places

* Juanda International Airport, Surabaya, Indonesia, IATA code SUB

People

* Bottom (BDSM), or "sub" for "submissive" * Substitute teacher

Christianity

* Sub tuum praesidium, an ancient hymn and prayer dedicated to the Blessed Virgin Mary.

Computing and technology

* , an HTML tag for subscript * SUB designates a subroutine in some programming languages * SUB, substitute character, ASCII character 26 * SUB, subtraction processor command * .sub (disambiguation), several file extensions * Subeditor * Subwoofer loudspeaker

Typography

* Subscript and superscript * Subtitle

Entertainment and media

* Sub (TV channel) * Sub (album), ''Sub'' (album), a 2000 album by Swiss industrial metal band Apollyon Sun * ''The Sub'', a 2017 American short horror film * Subs (novel), ''Subs'' (novel), a 2011 novel by Thor Kunkel

Other uses

* Seafarers' Union of Burma, or SUB * Submarine sandwich, or hero sandwich * Submarine, a warship with underwater travel capabilities. * Submersible, an underwater vehicle designed to be completely submerged or operate while submerged. * Subnature concept * Subscription