The Yin and the Yang of Mr. Go is a 1970 British thriller film directed by Burgess Meredith.

An American army deserter, fanatic and aspiring writer named Nero Finnigan, living in Hong Kong becomes involved with the notorious Mr. Go, a half Chinese half Mexican organized crime mastermind.

They conspire to blackmail an American weapons scientist, professor Bannister, into providing secrets to Mr. Go's organization for resale to the highest bidder, and Go secretly films the bisexual Bannister having sex with Nero.

[1] Leo Zimmerman, who is an American CIA agent and James Joyce scholar, then arrives and is charged with recovering the scientist and his work by whatever means necessary.

The film was shot on location in Hong Kong, except for the CIA boardroom scenes.