The 99th United States Colored Infantry was an infantry regiment of United States Colored Troops that served in the Union Army during the American Civil War and fought in the Western Theater of the American Civil War.

The regiment helped build Bailey's Dam during the actions near Alexandria.

Organized February 10, 1864, from 15th Corps de Afrique Infantry.

Advance from Franklin to Alexandria March 14–26, with Pontoon Train.

Designation of Regiment changed to 99th United States Colored Troops April 4, 1864.

[1] Organized April 4, 1864, from 5th Corps de Afrique Engineers.

2nd Brigade, 1st Division, United States Colored Troops, Dept.

Repair road and crossing over Cane River April 19–20.