Clone regimental commanders were clone trooper commanders placed in command of regiments.
Though many clone commanders had been shown to be in charge of regiments, the only known clones to have the rank of clone regimental commander was CRC-09/571, who commanded the regiment that participated in the Battle of Haruun Kal. It is also perhaps worth noting that 571 was promoted from battalion commander after participating in the Battles of Teyr and Geonosis, and Vill, a clone commander in charge of a regiment of the 501st Legion during the early days of the Galactic Empire.