A picnic is a meal eaten outside.
Picnic, Picnik or Piknik may also refer to:
- Picnic (play), a 1953 play by William Inge
- Picnic (1972 film), an Indian Bengali-language film starring Ranjit Mallick
- Picnic (1975 film), an Indian Malayalam-language film starring Prem Nazir and Laksmi
- Picnic (1996 film), a Japanese film directed by Shunji Iwai
- Picnic (2024 film), a South Korean drama film
- Picnic, a 2004 short film starring Yolandi Visser under her birth name Anri du Toit
- Picnic (manga), a yaoi manga by Yugi Yamada
- Picnic (TV series), a Mexican talk show
- Pic-Nic, a Spanish folk-pop band of the 1960s
- Picnic (album), an album by Robert Earl Keen
- Picnic – A Breath of Fresh Air, a sampler album issued by Harvest Records
- Picnic (band), a Russian rock band
- Picknick (album), a 1968 album by Boudewijn de Groot
- Shoulder picnic, a cut of pork
- Cadbury Picnic, a chocolate bar
- Toyota Picnic or Ipsum, a minivan
- Picnik, a former online photo editor
- Sky Picnic, a proposed pay-TV service from BSkyB
- Picnic (supermarkt) [nl], an online-only supermarket active in the Netherlands, Germany and France
- Problem In Chair, Not In Computer (PICNIC), a derogatory slang term for computer user error