Catherine West has announced her resignation as chair of Nine Entertainment, less than 18 months into the role, with former ABC deputy chair Peter Tonagh set to take the helm in November.

West, who has been on Nine’s board since 2016, was appointed chair in June last year, taking over from Peter Costello and overseeing a major culture review at the media giant.

She will formally step down at Nine’s annual meeting on November 7.

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