Green hat may refer to:
- Green Hat (software company), acquired by IBM in 2012
- Orientation of thinking in terms of new ideas in Edward de Bono's book Six Thinking Hats
- Green Hat Films, a US-based film company headed by Todd Phillips
- Green Hat, a 2004 film by Fendou Liu
- Green hat, the Ecclesiastical hat for a bishop
- The Green Hat (novel), a 1924 novel by Michael Arlen
- Green hat (chinese idiom), a Chinese term for cuckold
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