Operation Diamond Racket is a 1978 Indian Kannada-language action spy thriller film produced and directed by the duo Dorai–Bhagavan, starring Rajkumar and Padmapriya. The supporting cast features Chandralekha, Vajramuni, Thoogudeepa Srinivas, Tiger Prabhakar and Fighter Shetty.

The film was the fourth and the last in the CID 999 Franchise created along the lines of the James Bond and James Bond – styled films following Jedara Bale, Goa Dalli CID 999 and Operation Jackpot Nalli C.I.D 999. The film was re-released in 2013. This is the only colour movie in the franchise and also the only movie in the franchise to not feature Narasimharaju. The movie was dubbed in Hindi in 1983 as Jasoos 999. A fifth movie in the franchise titled Operation Golden Gang was announced but dropped owing to average response to this movie coupled with high budget for the sequel.The movie was shot in Nepal and became the first Kannada movie to be shot outside India. However, another Kannada movie which released four months later, Singaporenalli Raja Kulla is widely credited as the movie which started the trend of Kannada movies being shot outside India since it was shot in a country which is not an Indian neighbour.