The 1st Regiment of Life Guards was a cavalry regiment in the British Army, part of the Household Cavalry.

It was formed in 1788 by the union of the 1st Troop of Horse Guards and 1st Troop of Horse Grenadier Guards.

The regiment was formed in 1788 by the union of the 1st Troop of Horse Guards and 1st Troop of Horse Grenadier Guards.

In 1877, it was renamed 1st Life Guards and contributed to the Household Cavalry Composite Regiment in the Anglo-Egyptian War, in the Second Boer War and in the First World War from August to November 1914.

From 1916 to 1918, the Reserve Regiment contributed to the Household Battalion.