Mary's Ankle is a 1920 American silent comedy film directed by Lloyd Ingraham and written by Luther Reed based upon the play of the same name by May Tully.

The film stars Douglas MacLean, Doris May, Victor Potel, Neal Burns, James Gordon, and Lizette Thorne.

As described in a film magazine,[3] Dr. Arthur P. Hampton (MacLean), a struggling young physician, announces his marriage to a fictitious "Mary Jane Smith" in an effort to get his wealthy uncle George P. Hampton (Gordon) to give him and his two friends, a lawyer and a broker, sufficient funds to get them out of financial difficulties.

He then finds himself in a difficult position when an injured young woman is brought to his office for treatment proves to be Mary Jane Smith (May) and his uncle appears to meet the bride.

Matters become complicated when the uncle insists on their accompanying him on a trip to Hawaii and informs them that he is to marry a Miss Burns (Thorne), who is Mary's aunt.