The 31st Infantry Regiment, King Bhumibol's Guard (Thai: กรมทหารราบที่ 31 รักษาพระองค์ ในพระบาทสมเด็จพระบรมชนกาธิเบศร มหาภูมิพลอดุลยเดชมหาราช บรมนาถบพิตร) is a King's Guard regiment of the 1st Division, King's Guard of the Royal Thai Army. The regiment was created in 1955. The regiment, despite being designated an infantry regiment is in fact a rapid deployment force unit. They are trained to be elite paratroopers (currently, armored units have been added.), but they are not special forces or lrrp. The regiment is based in Lopburi. The regiment was honoured with the additional title of 'King Bhumibol Adulyadej's Guards'.