Mr. Billion is a 1977 action comedy/action-adventure film directed by Jonathan Kaplan. It is notable as the Hollywood debut of Terence Hill. It's also the last film of actor William Redfield, who died before its release.

In the film, a mechanic becomes the sole heir of his recently-deceased uncle. But he has to sign a document within a deadline in order to receive his inheritance. His uncle's assistant and a private detective conspire to prevent him from claiming his inheritance.