John Joseph O'Connor (November 23, 1885 – January 26, 1960) was an American lawyer and politician from New York City.

A leader of the conservative Democrats, he chaired the powerful House Rules Committee.

President Franklin Roosevelt made him a major target of his purge of Democrats who opposed the New Deal, and he was defeated in 1938.

O'Connor was a spokesman for big business and helped defeat Roosevelt's executive reorganization bill.

Ridiculing the New Deal Coalition, he mocked the poor people who “go to the public trough to be fed.”[4] He died in Washington, and was interred at Gate of Heaven Cemetery in Silver Spring, Maryland.