Her Bitter Cup (alternate title A Heart's Crucible) is a 1916 American silent film directed by Cleo Madison.

One of only two feature-length films directed by Madison, she also played the leading role, a fervent labor organizer who uses drastic methods to finance her cause of improving the miserable lot of the workers in a factory.

Her raison d'être is to improve the miserable lot of her fellow workers; her chief foe is the cruel factory-owner.

A contemporary review in the trade paper Motion Picture News gave a mixed opinion of the film, acknowledging Madison's skill and the story overall but expressing confusion about the resolution of the plot.

[4] In Moving Picture World, the review also expressed reservations, "The story is quite strong in some respects, but certain features seem to lack proper significance.