Willis Seaver Paine (January 1, 1848 – April 13, 1927) was an American lawyer and banker from New York.

[2] Prior to graduating, he began studying law in the office of Sanford E. Church, later the chief judge of the New York Court of Appeals.

He moved with his father in New York City in 1868, at which point he continued his law studies under Charles A. Rapallo, also a judge on the Court of Appeals.

The examination caused the closing of three trust companies in New York City, which owed depositors six million dollars.

In 1880, when the state legislature passed an act to appoint commissioners to make a compilation and revision of the state's banking laws, Governor Cornell appointed him and William Dowd, president of the Bank of North America, as the commissioners.

He was an organizer of the trust company and savings bank sections of the American Bankers Association.

He also authored books on New York state and national banking laws that were regarded as a standard and went through seven editions.