A rifle regiment is a military unit consisting of a regiment of infantry troops armed with rifles and known as riflemen. While all infantry units in modern armies are typically armed with rifled weapons the term is still used to denote regiments that follow the distinct traditions that differentiated them from other infantry units.
Rifles had existed for decades before the formations of the first rifle regiments, but were initially too slow to load and too unreliable for use as practical weapons for mass issue. With improvements in the designs of rifles, the first rifle regiment was raised very late in the 18th century as armies could now equip entire units of troops with these new weapons in preference to earlier firearms such as muskets. Though rifles still took about twice as long to load as a musket the increase in accuracy and change in tactics more than compensated for this delay.