III

:"Not to be confused with Ill (ill, ILL)." III (iii) is the Roman number for three, but may also refer to:
* III, official artist name for the Inti Creates sound team
* "III" (Download album), an album by the band Download
* "III" (Chad Brock album), an album by country music artist Chad Brock
* "III" (Joe Nichols album), an album by country music artist Joe Nichols
* "III" (Stanton Moore album), an album by Stanton Moore with Robert Walter and Will Bernard released 2006
* "III" (The Atomic Bitchwax album), an album by the band The Atomic Bitchwax
* "III", an album by country music artist Chad Brock
* III Records, a Japanese record label
* "Acid King III", an album by the band Acid King
* Hank Williams III (born 1972), American country singer, also known simply as III
* Jack White's personal signature is "III"
* "Led Zeppelin III", an album by Led Zeppelin
* "Sebadoh III", an album by the band Sebadoh
* III, an album by the progressive British rock band Black Widow (band)

III as an acronym may stand for:
* Information International, Inc., a computer technology company
* Innovative Interfaces, Inc. (III), a library-software company
* Insurance Information Institute (i.i.i.), a US industry organization
* Intelligence and Information Institute, a fictional USA government organization in the comic version of "Transformers"
* Internet Indirection Infrastructure (i3), an overlay network
* Inkjet & Hi-tech Innovation Institute (i.i.i.), a hi-tech industry network in India
* Integrated information infrastructure