Knyvett v Christchurch Casinos Ltd [1999] 2 NZLR 559 is a cited case in New Zealand regarding whether a contract illegal under statute, can be subsequently validated under the Illegal Contracts Act 1970.

The Casino argued that under the Casino Control Act 1990, gambling by a minor is illegal, and thus honouring any wager would be illegal under the Act.

However, the Act only prohibited a minor being on the premises of a Casino, it did not go as far as stating any bets would be illegal as well.

The casino successfully obtained a judgment from the High Court.

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