- Originated 21 December 1861 in Toronto, Ontario as The Toronto Engineers and Mechanics Rifle Corps
- First official designation 14 March 1862 as the 10th Battalion Volunteer Militia Rifles, Canada
- Redesignated 21 November 1862 as the 10th Battalion Volunteer Militia (Infantry), Canada
- Redesignated 10 April 1863 as the Tenth or "Royal Regiment of Toronto Volunteers"
- Reorganized 5 November 1880 with the appointment of Colonel Grasett and retirement of Colonel Shaw
- Redesignated 5 August 1881 as the 10th Battalion "Royal Grenadiers"
- Redesignated 8 May 1900 as the 10th Regiment "Royal Grenadiers"
- Served in the Great War as the 123rd Battalion, Royal Grenadiers, and supplied trained hundreds of infantry officers and men to several Canadian Battalions
- Redesignated 1 May 1920 as the Royal Grenadiers
- Amalgamated 15 December 1936 the Royal Grenadiers with the Toronto Regiment and redesignated as The Royal Regiment of Toronto Grenadiers