The Intrusion of Isabel is a 1919 American silent comedy film directed by Lloyd Ingraham and starring Mary Miles Minter, J.

[2] As described in various film magazine reviews,[3][4][5][6] Isabel Trevor (Minter) and her brother Bert (Jones), left penniless after the death of their father, sell their Southern home and move to New York, along with their servant Mammy Johnson (Harris).

One day, Bert steals a roll of money from Craig and flees to Montana without telling Isabel, leaving her with no way of paying her rent.

Her plans are thwarted however, when a young woman named Lois Randall (Shelby) arrives with a marriage license, which she claims that Craig signed at a drunken supper.

At the same time he arrives at the Craig residence, it transpires that Lois is in fact a criminal known as "Matrimony Mary" who seeks to extort money from men by the use of fraudulent marriage licenses.