The Demi-Brigade of the Foreign Legion, (French: Demi-brigade de Légion étrangère) existed briefly in Indochina while regrouping the ensemble of the Battalion Forming Corps (French: « bataillon formant corps », BFC) issued from the 1st Foreign Infantry Regiment 1er REI.

The Demi-Brigade would become on 1 September 1930 the 5th Foreign Infantry Regiment (French: 5e Régiment étranger d’infanterie).

On 1 September 1930 the BFC of the 1st Foreign Infantry Regiment 1er REI and the 1st battalion of the 1er REI newly arrived in the Far East allowed the constitution of four battalions of the 5th Foreign Infantry Regiment 5e REI: Nevertheless, the BFC (Battalion Forming Corps) (French: « bataillon formant corps ») remained until 1 April 1931.

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