Courtney Walker Hamlin (October 27, 1858 – February 16, 1950) was a U.S. representative from Missouri and cousin of William Edward Barton.

In 1869 moved to Missouri with his parents, who settled in Leasburg, Crawford County.

He attended the common schools and Salem Academy, where he studied law.

He served as chairman of the Committee on Expenditures in the Department of State (Sixty-second through Sixty-fifth Congresses).

He resumed the practice of law in Springfield, Missouri, until November 1935, when he retired and moved to Santa Monica, California, where he died February 16, 1950.