William Grose (December 16, 1812 – July 30, 1900) was a lawyer, politician, writer, and brigadier general in the Union Army during the American Civil War.

He passed the bar exam in 1842 and established a successful law practice and unsuccessfully ran for the United States Congress in 1852 as a Democrat.

Switching political parties, in 1856 he was a delegate to the Republican National Convention, supporting John C. Fremont's unsuccessful candidacy for President of the United States.

[2] With the outbreak of the Civil War, Grose was appointed colonel of the 36th Indiana Infantry in October 1861, a regiment he recruited and trained.

He and his men performed well during the Chattanooga Campaign in late 1863, taking part in the assault on Lookout Mountain and received praise in the official reports of the battle.

[4] Grose remained on active duty until he resigned his commission on 31 January 1866, to return to his law practice at New Castle, Indiana.