The London Scottish was a reserve infantry regiment then a company of the British Army. In its final incarnation it was A Company, the London Regiment until, on 1 May 2022, soldiers in the company transferred to foot guards regiments and the company became G (Messines) Company, Scots Guards, 1st Battalion London Guards.

The London Guards is a formation within the British Army comprising the reserve companies of the Grenadier, Coldstream, Scots and Irish Guards. On formation these companies drew their personnel from the London Regiment and it traces its history back to the formation of that regiment in 1908 when 26 separate Volunteer Force battalions were brought together. The London Guards is not a regiment, the companies wear the uniform, and follow the traditions, of their foot guards regiment.