The Serious Fraud Office (SFO; Māori: Te Tari Hara Tāware) is the public service department of New Zealand charged with detecting, investigating and prosecuting financial crimes, including corruption, of a serious and complex nature.

The SFO is New Zealand's lead law enforcement agency for investigating and prosecuting serious financial crime, including bribery and corruption.

The agency is based upon its UK counterpart as established by the Serious Fraud Office Act 1990.

[5] When set up under the Serious Fraud Office Act 1990, the responsible minister was the Attorney-General.

[6] The Labour government announced in September 2007 that the SFO would be replaced by a new Organised Crime Agency.