Millionaires in Prison is a 1940 American crime drama film directed by Ray McCarey and written by Lynn Root and Frank Fenton.

The film stars Lee Tracy, Linda Hayes, Raymond Walburn, Morgan Conway and Truman Bradley.

He befriends the prison doctor, Bill Collins, who is seeking a cure for a deadly virus (referred to as 'Malta fever' during the film) and needs guinea pigs for his experimental drugs.

Burton looks up two other rich inmates, Bruce Vander and Harold Kellogg, jailed for income tax evasion.

A pair of millionaire con men, James Brent and Sidney Keats, attempt a stock swindle even while behind bars, but Burton takes it upon himself to thwart their plans.