Diddy may refer to:
- Sean Combs, an American rap mogul also known as Puff Daddy, P. Diddy, Puff, Puffy and Sean John
- David Hamilton (broadcasting), a British Broadcaster
- Diddy Kong, a fictional Nintendo character
- Diddy (DJ), 1990s dance act responsible for the hit single "Give Me Love"
- Diddy Men, the fictitious dwarves created and popularised by British comedian Ken Dodd