Battery B, 1st Missouri Light Artillery Regiment, also known as Welfley's Independent Missouri Battery, was an artillery battery that served in the Union Army during the American Civil War. Organized in September 1861, Welfley's Independent Battery fought at Pea Ridge and in the White River campaign. After its name changed to Battery B, 1st Missouri in December 1862, it fought at Cape Girardeau, Chalk Bluff, Vicksburg, Sterling's Plantation, and Brownsville. In September 1864, the unit ceased to exist when it was consolidated with three other Missouri batteries while stationed at New Orleans.