Limelight
A former famous vaudeville star saves a young ballerina from a suicide attempt. He nurses her back to health and helps her regain her self-esteem so she can return to the stage.
Although it was not his last film, it seems likely that Chaplin made Limelight as a farewell film. It is definitely a very personal film in which he himself plays an old clown who was once beloved, but whose work is now largely forgotten. Also with Buster Keaton and Chaplin's son Sidney.