Bottom can refer to:

• Buttocks
• Bottom (sex), a term used by gay, BDSM, and some straight couples
• Bottom (BDSM)
• Nick Bottom, a character from Shakespeare's A Midsummer Night's Dream
• Bottom (TV series), a British sitcom and stage show
• The bottom quark, a subatomic particle
• Bottom element, in lattice theory and related branches of mathematics
• Bottom type, or empty type, in type theory
• "Bottom", a song by Tool from their 1993 album Undertow
• A cargo ship