Cyrus Y. Jacobs (December 23, 1831—June 28, 1900) was a grain mill owner, distiller, and merchant in Boise, Idaho.

[1] While headed along a miner's trail to Idaho City with a pack train in 1863, Jacobs followed Major Pinkney Lugenbeel and a company of soldiers en route to rebuild Fort Boise.

He sold his supplies near the fort, and when the barracks had been established, Jacobs along with H.C. Riggs and Frank Davis platted the townsite of Boise City.

[12] In 1881 the Idaho Statesman reported that Jacobs had produced a version of cherry bounce that was "better than Jaynes' Elixir of Life and will cure a cold, the blues or anything else that goes wrong.

[17] In 1894 he was found incompetent to conduct his business affairs, and Mary Jacobs petitioned and was granted a court appointed guardian for her husband.