Sub may refer to:
Subeditor, somebody who copy edits for a newspaper or magazine
Submarine sandwich
Substitute (disambiguation)
Substitute teacher
Subtitle (captioning)
Bottom (BDSM), also called "sub" (short for "submissive")
Subwoofer loudspeaker
Sub (TV channel)
SUB as subtraction command in processor instruction set
Substitute character, one of the C0 and C1 control codes
.sub (disambiguation), several file extensions
<sub>, an HTML tag used to put a character string as a subscript
the subservient partner in sadomachistic role games
Seafarers' Union of Burma
Summit Bancorp
Juanda International Airport in Surabaya, Indonesia

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