1st Infantry Division (Thailand)

1st Division, King's Guard
กองพลที่ 1 รักษาพระองค์
Emblem of the 1st Infantry Division, King's Guard
Active	1905-present
Country	Thailand
Branch	Royal Thai Army
Type	Infantry
Size	Division
Garrison/HQ	Bangkok, Thailand
Nickname(s)	Wongthewan (วงศ์เทวัญ, Divine clique)
Website	www.rta.mi.th/21100u

The 1st Division, King's Guard (Thai: กองพลที่ 1 รักษาพระองค์) (พล.๑ รอ.) is an infantry division of the Royal Thai Army, it is currently a part of the First Army Area. The division was founded by King Chulalongkorn (Rama V) in 1905. In 1973 the division was designated a King's Guard unit by royal command of King Bhumibol Adulyadej (Rama IX).

The division comprises three infantry regiments and four attachment units, the 1st Infantry Regiment, King's Own Bodyguard, the 11th Infantry Regiment, King's Guard and the 31st Infantry Regiment, King's Guard. The division and its subsidiary units are mostly based in or around Bangkok, Thailand. The 31st Regiment is garrisoned in Lopburi.

The division was formed in 1905 by the command of King Chulalongkorn on the recommendation of the Prince Chirapravati Voradej, the director of operations of the Ministry of Defence. The Prince wanted to organise the Siamese army on European lines, comprising at least ten army divisions. By 1906 the 1st Division was fully recruited and was garrisoned in Bangkok. In 1908, the army was once again reorganised, by this date the division was made up of five units (1st Infantry Regiment, King's Own Bodyguard, 2nd Infantry Regiment (the name later changed to 11th Infantry), 1st Cavalry Regiment, 1st Artillery Battery and the 1st Engineer Regiment). The 1st Division was then given the responsibility of protecting the king, his Grand Palace, the royal capital and the surrounding Menam basin.