Mason Cook Darling (May 18, 1801 – March 12, 1866) was an American medical doctor, politician, and Wisconsin pioneer.

Upon the admission of Wisconsin as a State into the Union, Darling was elected as a Democrat to the Thirtieth Congress.

He represented Wisconsin's newly created 2nd congressional district and served from June 9, 1848, to March 3, 1849.

Darling founded Fond du Lac Lodge 26 Freemasons in 1849, and served as its First Master.

[5] He resumed the practice of medicine and was a dealer in real estate at Fond du Lac until 1864, when he moved to Chicago, at the same time as the Eastmans.