Operation Diamond Racket is a 1978 Indian Kannada-language action spy thriller film produced and directed by Dorai–Bhagavan.

The film stars Rajkumar, alongside Padmapriya, Chandralekha, Vajramuni, Thoogudeepa Srinivas, Tiger Prabhakar and M. B. Shetty.

[3] A fifth film 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.

Prakash traces the lead from his colleague Madhu and locates David, the local kingpin.

Monzein, Prakash's friend and fellow-agent helps him with clues about antique shops, which are suspected to be involved in smuggling.

Prakash spends quite some time, posing as a tourist, but cannot locate any clues about the smuggling gang.

He observes a speech, where the diamonds are used as a powerful beam to bring down any fighter jet-planes, submarine or military installation.