| Proto | 1 | Merlin 21 | Prototype |
| PR.I | 10 | Merlin 21 | Unarmed photo reconnaissance prototypes. |
| F.II | 595 | Merlin 21/23 | 4x20mm cannon and 4x.303 machine guns. 99 cv to XII and one further cv to XVII. 99 cv to XVII. 3 cv to T.III |
| T.III/NF.II | 369 | Merlin 21/23 | Dual control trainer. No armament |
| B.IV | 311 | Merlin 21/23 | Unarmed bomber. 4x250lb bomb or 1x4000lb bomb. 5 cv to NF.XV. 1 cv to B.XVI. 27 cv to PR.IV. 5 cv to PR.VIII. 1 cv to B.V |
| PR.IV | 0 | Merlin 21/23 | Unarmed photo reconnaissance variant. 27 cv ex B.IV |
| B.V | 0 | Merlin 23 | New standard wing with 2x50gal drop tanks or 2x500lb bombs. 1 cv ex B.IV (W4057) |
| FB.VI | 2304 | Merlin 22/23/25 | Developed from NF.II with same armament plus drop tanks or 500lb bombs or 4x60lb rockets. 18 cv to XVIII. 2 cv to TR33 |
| B.VII | 25 | Packard Merlin 31 | Canadian built version based on B.V |
| PR.VIII | 0 | Merlin 61 | 5 cv from B.IV |
| B.IX | 54 | Merlin 72 | 4x500lb bombs plus wing tanks/bombs. Later option for 1x4000lb bomb |
| PR.IX | 90 | Merlin 72 | P.R. version of B.IX |
| NF.XII | 0 | Merlin 21/23 | 4x20mm cannon. 99 cv ex F.II. 1 cv to XVII |
| NF.XIII | 270 | Merlin 21/23 | Night fighter with AI Mk.8 radar |
| NF.XV | 0 | Merlin 61 | High altitude pressurised fighter with 4x.303 machine guns under fuselage. 5 cv ex B.IV |
| B.XVI | 400 | Merlin 72/73/76/77 | 3000lb later 4000lb bomb plus wing tanks/2x500lb bombs. 29 cv to TT.39 |
| PR.XVI | 435 | Merlin 72/73/76/77 | PR version of B.XVI with extra tanks in bomb bay. |
| NF.XVII | 0 | Merlin 21/23 | Similar to NF.XII with AI Mk.10 radar. 100 cv ex F.II |
| FB.XVIII | 0 | Merlin 25 | 'Tsetse' with 6-pounder anti-tank gun in nose. 18 cv ex FB.VI |
| NF.XIX | 280 | Merlin 25 | Similar to NF.XIII with either Mk.8 or Mk.10 radar |
| B.XX | 245 | P.Merlin 31/33 | Canadian version of B.VII |
| FB.21 | 3 | P.Merlin 31/33 | Canadian version of FB.VI. 1 used for B.24 development |
| T.22 | 6 | P.Merlin 33 | Canadian dual control trainer |
| FB.24 | 0 | P.Merlin 301 | High altitude development of FB.21. 1 cv ex FB.21 (KA102) |
| B.25 | 400 | P.Merlin 225 | Canadian version of B.XX |
| FB.26 | 396 | P.Merlin 225 | Canadian version of FB.VI |
| T.27 | 19 | P.Merlin 225 | Canadian development of T.22 |
| T.29 | 39 | P.Merlin 225 | Canadian trainer version of FB.26 |
| NF.30 | 530 | Merlin 72/76/113 | High altitude development of NF.XIX. 1 cv to NF.36 |
| PR.32 | 4 | Merlin 113/114 | High altitude development of PR.XVI |
| TR.33 | 52 | Merlin 25 | FAA variant of FB.VI with folding wings |
| PR.34 | 181 | Merlin 113/114 | Long range development of PR.XVI. 36 cv to PR34A |
| B.35 | 276 | Merlin 114/114A | Similar to B.XVI. 13 cv to PR.35. 146 cv to TT.35 |
| NF.36 | 163 | Merlin 113 | Development of NF.30. 4x20mm cannon. Mk.10 radar. 1 cv to NF.38 |
| TR.37 | 6 | Merlin 25 | Torpedo fighter/bomber ASV Mk.13B radar |
| NF.38 | 101 | Merlin 113/114 | Similar to NF.36 with AI Mk.9 radar. Plus 1 cv ex NF.36 |
| TT.39 | 0 | Merlin 21 | Target tug. 29 cv from B.XVI |
| FB.40 | 212 | P.Merlin 31/33 | Australian version of FB.VI. 6 cv to PR.40. 29 cv to PR.41. 22 cv to T.43 |
| PR.40 | 0 | P.Merlin 31/33 | Australian PR. 6 cv ex FB.40 |
| PR.41 | 0 | P.Merlin 69 | Australian PR. 29 cv ex FB.40 |
| T.43 | 0 | P.Merlin 31/33 | Australian trainer. 22 cv ex FB.40 |
