Christopher Grant Champlin (April 12, 1768 – March 18, 1840) was United States Representative, Senator and a slave trader from Rhode Island.

[1] His uncle George Champlin was a member of the Rhode Island Legislature and also funded slave voyages to Africa;[2] his niece, Elizabeth Mason (daughter of his sister of the same name), married Commodore Oliver Hazard Perry.

[3] On his return, he settled in New York, where he lost a fortune speculating in the stock market with his fathers' proceeds from mercantile business and slave trading.

[4] He continued to engage in mercantile pursuits, and was later elected to the U.S. Senate to fill the vacancy caused by the death of Francis Malbone and served from June 26, 1809, until October 2, 1811, when he resigned and returned to Rhode Island.

[8] Champlin was president of the Rhode Island Bank until a short time before his death in Newport in 1840; interment was in Common Burial Ground.