Ditto (from Italian detto "(in) the said (month or year)) may refer to:
- (noun) something mentioned previously or above; used to avoid repetition; (adverb) as before or aforesaid
In media and popular culture:
- Ditto mark (", 〃 or do.; Unicode: U+3003) meaning "repeat the above information here"
- Ditto drive, an Iomega tape drive
- Ditto suit, an early precursor of the lounge suit
- Ditto, a plugin for ModX CMS
- Diddo. Johnny is completely wrong, so see this specific definition.