Auxiliary Regiments
Auxiliary or volunteer regiments were usually civilian volunteer corps formed to support the regular military.
- 1917 - Formation of Indian Defence Force (IDF), disbanded at the end of the war
- 1920 - Formation of Auxiliary Force (India) (AFI)
Cavalry
- 1st United Provinces Horse
- 7th (Southern Regiment) United Provinces Horse
- Allahabad Light Horse
- Allahabad Troop Light Horse
- Assam Valley Light Horse
- Assam Valley Mounted Rifles
- Bihar Light Horse
- Bihar Mounted Rifles
- Bombay Light Horse
- Bombay Light Motor Patrols
- Bombay Light Patrol
- Cachar and Sylhet Mounted Rifles
- Calcutta Light Horse
- Calcutta Mounted Volunteer Rifles
- Calcutta Mounted Rifles
- Calcutta Volunteer Lancers
- Cawnpore Light Horse
- Central Bengal Light Horse
- Chota Nagpur Light Horse
- Chota Nagpur Mounted Rifles
- Chota Nagpur Regiment
- Darrang Mounted Infantry
- Darrang Mounted Rifles
- Dehra Dun Mounted Rifles
- Ghazipur Light Horse
- Gorakhpur Light Horse
- Lakimpur Mounted Rifles
- Northern Bengal Mounted Rifles
- Nowgong Mounted Rifles
- Oudh Light Horse
- Punjab Light Horse
- Sibsagar Mounted Infantry
- Sibsagar Mounted Rifles
- Southern Provinces Mounted Rifles
- Surma Valley Light Horse
- United Provinces Horse (Southern Regiment)
- United Provinces Light Horse
1917 redesignations
Corps redesignated as numbered battalions on the 1st April 1917 on formation of the IDF:
1920 redesignations
Battalions and regiments redesignated on the 1st October 1920 on formation of the AFI:
Artillery
Volunteer units of the Royal Artillery in India.
1917 redesignations
Batteries and brigades redesignated on the 1st April 1917 on formation of the IDF:
1920 redesignations
Batteries and brigades redesignated on the 1st October 1920 on formation of the AFI:
1933 redesignations
Batteries and brigades redesignated in 1933:
Engineers
- No. 1 (Calcutta) Field Company
- No. 3 (Bombay) Field Company
- No. 4 (Karachi) Field Company
- No. 1 (Calcutta) Fortress Company
- No. 3 (Bombay) Fortress Company
- No. 4 (Karachi) Fortress Company
- No. 1 Electrical Engineer Company
- No. 3 Electrical Engineer Company
- No. 4 (Karachi) Electrical and Mechanical Company
- No. 4 (Searchlight) Company
- Calcutta Port Defence Volunteers
Corps Of Signals
Infantry
- Agra Volunteer Rifle Corps
- Allahabad Rifles
- Allahabad Volunteer Rifle Corps
- Assam Bengal Railway Battalion
- 42nd Assam Bengal Railway Battalion
- Assam-Bengal Railway Volunteer Rifles
- Bangalore Battalion
- Bareilly Contingent
- Bellary Volunteer Rifle Corp
- Bengal and North-Western Railway Volunteer Corps
- Bengal Nagpur Railway Battalion
- Bengal Nagpur Railway Regiment
- 36th Bengal Nagpur Railway Regiment
- Bengal Nagpur Railway Volunteer Rifle Corps
- Berar Volunteer Rifle Corps
- Bhusawal Company
- Bombay, Baroda and Central India Railway Volunteer Corps
- Bombay Volunteer Rifle Corps
- Burma Railways Volunteer Corps
- Calcutta and Presidency Battalion
- Calcutta Scottish
- Cawnpore Rifles
- Cawnpore Volunteer Rifle Corps
- Coorg and Mysore Rifle Corps
- Darjeeling Volunteer Rifle Corps
- Dehra Dun Contingent
- Delhi Contingent
- East Coast Rifle Volunteer Corps
- Eastern Bengal Company
- Eastern Bengal State Railway Volunteer Rifle Corps
- 7th East Indian Railway Battalion
- 7th East Indian Railway Corps
- 12th Eastern Bengal Railway Battalion
- Eastern Bengal Railway Battalion
- East Indian Railway Regiment
- Eastern Bengal Railway Volunteer Rifle Corps
- East Indian Railway Volunteer Rifle Corp
- Gauhati Rifles
- Ghadeshi Volunteer Rifle Corps
- Ghazipur Volunteer Rifle Battalion
- Ghazipur Volunteer Rifle Corps
- Godavari Rifle Volunteer Corps
- Great Indian Peninsula Railway Volunteer Corps
- Hyderabad Rifles
- Kolar Gold Fields Battalion
- Lakhimpur Volunteer Rifle Corps
- Lucknow Rifles
- Lucknow Volunteer Rifle Corps
- Madras and Southern Mahratta Railway Rifles
- 32nd Madras and Southern Mahratta Railway Rifles
- Madras Guards
- Madras Railway Volunteers
- Midland Railway Volunteer Corps
- Nagpur Regiment
- Nagpur Rifles
- 2nd Nagpur Rifles
- Nilgiri Malabar Battalion
- Northern Bengal Volunteer Rifle Corps
- Northern Bengal State Railway Volunteer Rifle Corps
- North-Western Railway Battalion
- 24th North-Western Railway Battalion
- North-Western Railway Regiment
- North-Western Railway Volunteer Rifles
- Orissa Volunteer Rifles
- Oudh and Rohilkhand Railway Battalion
- Oudh Volunteer Rifle Corps
- Poona Rifles
- Punjab Light Horse (Volunteers)
- Punjab Rifles
- 3rd Punjab Rifles
- 1st Punjab Volunteer Rifle Corps
- 2nd Punjab Volunteer Rifle Corps
- 3rd Punjab (North-Western Railway) Volunteer Rifle Corps
- Rajputana-Malwa Volunteer Rifle Corps
- Shillong Volunteer Rifles
- Simla Rifles
- 4th Simla Rifles
- Simla Volunteer Rifle Corps
- Sind, Punjab and Indus Valley Railways Volunteer Rifle Corps
- Sind Rifles
- South Andaman Volunteer Rifle Corps
- Southern Mahratta Railway Rifle Corps
- South Indian Railway Battalion
- 29th South Indian Railway Battalion
- South Indian Railway Volunteer Rifle Corps
- St. Michael's School Cadet Corps
- Sylhet Volunteer Rifle Corps
- Tirhoot State Railway Volunteer Rifle Corps
- Upper Burma Volunteer Rifle Corps
- Vizagapatam Rifle Volunteer Corps
- Yarcaud Company
1917 redesignations
Corps redesignated as numbered battalions on the 1st April 1917 on formation of the IDF:
1920 redesignations
Battalions and regiments redesignated on the 1st October 1920 on formation of the AFI: