Royal Northumberland Fusiliers
| Dates | Locations | Higher Formation/Remarks |
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| . | 4th Battalion, The Royal Northumberland Fusiliers | . |
| 1947.01.01 | Reconstituted in T.A. with HQ at Hexham | 149 (Northumberland) Infantry Brigade |
| . | A Company at Newburn | . |
| . | B Company at Newburn | . |
| . | C Company at Haltwhistle | . |
| . | D Company at Prudhoe | . |
| 1950.09.01 | 4th/5th Battalion, The Royal Northumberland Fusiliers formed with HQ at Hexham by amalgamation with 588 LAA Regiment RA (Royal Northumberland Fusiliers) | . |
| . | A Company | . |
| . | B Company | . |
| . | C Company | . |
| . | D Company | . |
| 1967.03.31 | Disbanded and concurrently amalgamated with 6th Battalion to form two units: | . |
| . | A Company (Royal Northumberland Fusiliers), Fusilier Volunteers in TAVR II at Sandyford, Newcastle | . |
| . | The 4th/5th/6th (Territorial) Battalion, The Royal Northumberland Fusiliers in TAVR III with HQ at Newcastle | . |
| . | A Company at Newcastle, successor to 6th Battalion | . |
| . | B Company at Newcastle, successor to 6th Battalion | . |
| . | C Company at Hexham, successor to 4th/5th Battalion | . |
| . | D Company (Tyneside Scottish) at Gosforth, successor to Q Battery (Tyneside Scottish), 439 (Tyne) LAD Regiment RA. | . |
| 1968.04.23 | Fusilier Volunteers redesignated as 5th (Volunteer) Battalion, The Royal Regiment of Fusiliers | . |
| 1969.01.01 | TAVR III element reduced to cadre as 4th/5th/6th Battalion, The Royal Northumberland Fusiliers at Newcastle, sponsored by 5th (V) Bn, The Royal Regiment of Fusiliers | . |
| 1971.04.01 | Reorganised as two companies: | . |
| . | A Company (Royal Northumberland Fusiliers), 5th (Volunteer) Battalion, The Royal Regiment of Fusiliers at Sandyford, Newcastle | . |
| . | C (4th/5th/6th Royal Northumberland Fusiliers) Company, Northumbrian Volunteers, reconstituted from cadre at Newcastle and Gosforth | . |
| 1975.04.01 | United with two companies descended from 7th Battalion, The Royal Northumberland Fusiliers, to form 6th (V) Battalion, The Royal Regiment of Fusiliers | . |
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| . | 43rd (6th (City) Battalion, The Royal Northumberland Fusiliers) Royal Tank Regiment | . |
| 1947.04.01 | Reconstituted in T.A. with HQ at Newcastle | . |
| 1956.11.01 | Converted to infantry 6th Battalion, The Royal Northumberland Fusiliers | . |
| 1967.04.01 | Disbanded and concurrently with 4th/5th Battalion to form A Company (The Royal Northumberland Fusiliers), Fusilier Volunteers, and The 4th/5th/6th (T) Battalion, The Royal Northumberland Fusiliers | . |
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| . | 7th Battalion, The Royal Northumberland Fusiliers | . |
| 1947.04.01 | Reconstituted in T.A. with HQ at Alnwick, and concurrently absorbed 9th Battalionwithout change of title | 149 (Northumberland) Infantry Brigade |
| . | A Company at Morpeth | . |
| . | B Company at Ashington | . |
| . | C Company at Alnwick | . |
| . | D Company at Berwick | . |
| 1967.04.01 | Disbanded and concurrently reconstituted in TAVR III as 7th (Territorial) Battalion, The Royal Northumberland Fusiliers with HQ at Alnwick, absorbing elements of The Northumberland Hussars | . |
| . | B (Ashington) Company at Ashington | . |
| . | C (Alnwick) Company at Alnwick | . |
| . | D (Berwick) Company at Berwick-upon-Tweed | . |
| 1969.01.01 | Reduced to cadre at Ashington, sponsored by 5th (V) Bn, The Royal Regiment of Fusiliers, less some personnel to form E (Northumberland) Company, 5th (V) Battalion, The Royal Regiment of Fusiliers at Ashington and Alnwick | . |
| 1971.04.01 | Reorganised as two companies: | . |
| . | E (Northumberland) Company, 5th (V) Battalion, The Royal Regiment of Fusiliers at Ashington and Alnwick | . |
| . | D (7th Royal Northumberland Fusiliers) Company, Northumbrian Volunteers, reconstituted from cadre at Alnwick and Berwick upon Tweed | . |
| 1975.04.01 | United with two companies descended from 4th/5th/6th Battalion, The Royal Northumberland Fusiliers, to form 6th (V) Battalion, The Royal Regiment of Fusiliers | . |
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