The Criminal Investigator (Traditional Chinese: O記實錄; lit.

'The O Files') is a 1995 Hong Kong police procedural television drama.

Produced by Jonathan Chik with a screenplay co-written and edited by Chow Yuk-ming, the drama is a TVB production.

The story follows a team of investigators from the Organized Crime and Triad Bureau (OCTB) unit of the Royal Hong Kong Police Force.