Catterick Garrison is a major garrison and town three miles (4.8 km) south of Richmond in the Richmondshire district of North Yorkshire, England. It is the largest British Army garrison in the world with a population of around 13,000 and measuring over 2,400 acres, however under plans announced by the Ministry of Defence (MoD) in November 2005, the population of Catterick Garrison is expected to grow to over 25,000 by 2020, making it the largest population centre in the local area.

Catterick is the largest of three Infantry Training Centres (ITCs) in the UK. ITC Catterick conducts infantry training combining Phase 1 and Phase 2 of the Combat Infantryman's Course. Junior soldiers destined for the infantry continue to receive Phase 1 training at the Army Foundation College in Harrogate. ITC Catterick is the major user of the Warcop Training Area.

The siting of the garrison was first recommended by Robert Baden-Powell who founded the Scouting movement in 1908 whilst he, as Inspector-General of Cavalry, was based at the army barracks—at that time located in Richmond Castle. On 12 August 1914, the order was issued for the construction of the camp, following the outbreak of the Great War.

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