The 1st Cavalry Regiment is a United States Army regiment that has its antecedents in the early 19th century in the formation of the United States Regiment of Dragoons. To this day, the unit's special designation is "First Regiment of Dragoons". While they were the First Regiment of Dragoons another unit designated the 1st Cavalry Regiment was formed in 1855 and in 1861 was re-designated as the 4th Cavalry Regiment. The First Dragoons became the 1st Cavalry Regiment since they were the oldest mounted regiment.

Dragoons were originally a class of mounted infantry, who used horses for mobility, but dismounted to fight on foot. From the early 17th century onward, dragoons were increasingly also employed as conventional cavalry and trained for combat with swords and firearms from horseback. While their use goes back to the late 16th century, dragoon regiments were established in most European armies during the 17th and early 18th centuries; they provided greater mobility than regular infantry but were far less expensive than cavalry.