Benjamin Alden Bidlack (September 8, 1804 – February 6, 1849) was an American politician, diplomat, and attorney who served as a member of the US House of Representatives and was later appointed chargé d'affaires to New Granada.
As a congressman, Bidlack became sympathetic to the case of Frances Slocum, a white woman who had been abducted as a child and raised by the Miami people.
In 1845, Congress passed a joint resolution originally introduced by Bidlack that exempted Slocum and twenty-one of her Miami relatives from removal to Kansas Territory.
Bidlack was instructed to gather information about crossing routes on the Isthmus of Panama and prevent other nations from securing transit rights from New Granada.
President Polk was surprised by Bidlack's actions and initially opposed the treaty because of the commitment to defend New Granada.