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A pillar of Wellington's Circa Theatre since co-founding it in 1976, Henwood appeared in many plays, films and television programmes, notably the sitcom Gliding On.
Circa Theatre confirmed Henwood's death today,
Henwood also did one-man performances as the poet Dylan Thomas and the actor Richard Burton - both fellow Welshmen.
He graduated in chemistry at Swansea University before emigrating to New Zealand aged 25 and worked as a teacher and forensic toxicologist while developing a second career as an actor, eventually turning professional in 1970.
Drawing on his work as a forensic chemist, he campaigned against the use of cannabis and was author of the 1970 book A Turned On World - Drugs in New Zealand.
Henwood is survived by his second wife, the retired judge Carolyn Henwood, and their two children, one of whom is the comedian, Dai Henwood.