The 40th Indian Infantry Brigade was an administrative formation of the Indian Army during World War II. It was formed in September 1942, by the conversion of the HQ Shaiba Line of Communications Sub-Area. It served on Lines of Communication duties under the 2nd Indian Infantry Division in Iraq. In October 1944, the brigade was converted to HQ South Iraq Area. The final disposition of HQ South Iraq Area is not clear from available sources.

Formation

• Bikanir Sadul Light Infantry September 1942 to May 1943
• 1st Indore Infantry September to December 1942
• 25th Sikh Light Infantry
  Sikh Light Infantry
  The Sikh Light Infantry previously known as The Mazabhi and Ramdasia Sikh Regiment is an elite Regiment of the Indian Army. Its name was changed to the Sikh Light Infantry in 1944. The Sikh Light Infantry is the successor unit to the Mazhabi Sikh Pioneers 23rd, 32nd and 34th Sikh Pioneers...
  
   May to December 1943
• 26/12th Frontier Force Regiment
  12th Frontier Force Regiment
  The 12th Frontier Force Regiment was part of the British Indian Army. It was formed in 1922. It consisted of five regular battalions; numbered 1 to 5 and the 10th Battalion. During the Second World War a further ten battalions were raised. In 1945 the prenomial "12th" was dropped when the British...
  
   May 1943 to October 1944
• 28/3rd Madras Regiment
  3rd Madras Regiment
  The 3rd Madras Regiment was an infantry regiment of the British Indian Army formed after the World War I reforms of the Indian Army. The infantry regiments were converted into large regiments with four or five battalions in each regiment plus a training battalion, always numbered the 10th The...
  
  December 1943 to October 1944