| Presidency of Bengal | Presidency of Bengal | ||||
| 1795: | Calcutta Native Militia │ |
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| Presidency of Bombay | │ | ||||
| 1803: | 1st Battalion, 22nd Regiment of Bengal Native Infantry │ |
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| 1817: | │ │ │ │ |
1st Battalion, 10th Regiment of Bombay Native Infantry │ |
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| 1823: | │ │ │ │ |
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1st Battalion, 33rd Regiment of Bengal Native Infantry │ |
1st Regiment of Bengal Local Infantry │ │ |
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| 1824: | 43rd Regiment of Bengal Native Infantry │ |
19th Regiment of Bombay Native Infantry │ |
65th Regiment of Bengal Native Infantry │ |
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| 1842: | 43rd Regiment of Bengal Native Light Infantry │ |
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| 1859: | │ │ │ |
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1st Alipore Regiment of Bengal Local Infantry │ |
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| Rebuilding the Bengal Army | │ | Rebuilding the Bengal Army | |||
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| 1861: | 6th Regiment of Bengal Native Light Infantry │ |
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10th Regiment of Bengal Native Infantry │ |
22nd Regiment of Bengal Native Infantry │ |
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| 1861: | │ │ │ |
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18th Regiment of Bengal Native Infantry │ |
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| 1864: | │ │ │ │ |
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18th (Alipore) Regiment of Bengal Native Infantry │ |
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| 1885: | 6th Regiment of Bengal Light Infantry │ |
19th Regiment of Bombay Infantry │ |
10th Regiment of Bengal Infantry │ |
18th Regiment of Bengal Infantry │ |
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| 1897: | 6th Jat Regiment of Bengal Light Infantry │ |
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10th (Jat) Regiment of Bengal Infantry │ |
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| 1901: | 6th Jat Light Infantry │ |
19th Bombay Infantry │ |
10th Jat Infantry │ |
18th Bengal Infantry │ |
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| 1902: | │ │ |
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18th Muselman Rajput Infantry │ |
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| Renumbering into the Indian Army | |||||
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| 1903: | │ │ |
119th Infantry (The Mooltan Regiment) |
10th Jats | 18th Infantry | |
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| 1916: | │ │ |
2nd Bn raised │ |
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| 1917: | 2nd Bn raised │ |
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2nd Bn raised │ |
2nd Bn raised │ |
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| 1920: | │ │ |
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2nd Bn disbanded │ |
2nd Bn disbanded │ |
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| 1921: | 6th Royal Jat Light Infantry │ |
2nd Bn disbanded │ |
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| 2nd Bn → | │ | │ | │ | → 2nd Bn, 6th | |
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| 1922: | 1st Royal (Light Infantry) Bn, | 2nd (Mooltan) Bn, | 3rd Bn, | 4th Bn, | 10th (Training) Bn, |
| 9th Jat Regiment | |||||
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| 1923: | 4th Bn disbanded │ |
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| 1940: | 4th Bn raised │ |
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| 1941: | 5th Bn raised 6th Bn raised 7th Bn raised 8th Bn raised 9th Bn raised 14th Bn raised │ |
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| 1942: | 2nd Bn captured 4th Bn captured 10th Bn → Regimental Center │ |
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| 1943: | 15th Bn raised │ |
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| 1945: | The Jat Regiment │ |
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| 1946: | 2nd Bn raised 7th Bn disbanded 8th Bn disbanded 9th Bn disbanded 15th Bn disbanded │ |
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| 1947: | 14th Bn disbanded │ |
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| Union of India | |||||
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| 1947: | 1st, 2nd, 3rd, 5th and 6th Bn │ |
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| Republic of India | |||||
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| 1950: | ![]() │ |
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| 1959: | 8th Bn raised │ |
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| 1962: | 4th Bn raised 7th Bn raised │ |
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| 1963: | 9th Bn raised 14th Bn raised 15th Bn raised │ |
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| 1964: | 11th Bn raised 16th Bn raised │ |
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| 1966: | 17th Bn raised 18th Bn raised │ |
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| 1970: | 31st Bn raised │ |
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| 1972: | 31st Bn → 12th Bn │ |
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| 1979: | 1st Bn → 2nd Bn, The Mechanised Infantry Regiment │ |
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| 1980: | 19th Bn raised │ |
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| 1985: | 20th Bn raised │ |
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| 1987: | 21st Bn raised │ |
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