List of tank main guns
This is a list of tank main guns which are designed or used as the primary weapon of combat by tanks, such as light tanks, medium tanks, heavy tanks, or main battle tanks. Many tanks have other, secondary weapons installed in them, such as machine guns, autocannons and small calibre mortars, which are not included in this list.
Also excluded from this list are weapons installed in self-propelled artillery vehicles such as assault guns or tank destroyers that usually lack turrets. This is due to the unique nature of turreted tank tactics, their design, and operation.
List of tank guns
| Caliber | Weapon name | Country of origin | Period |
| 20 | TNSh | World War II | |
| 20 | 2 cm KwK 30 | Nazi Germany | 1930s |
| 20 | Breda 35 | World War II | |
| 25 | 25 SA 35 | World War II | |
| 37 | 3.7 cm ÚV vzor 34 | World War II | |
| 37 | 3.7 cm ÚV vzor 38 | World War II | |
| 37 | PS-1 | 1930s | |
| 37 | PS-2 Model 1930 | 1930s | |
| 37 | B-3 Model 1930 | 1930s | |
| 37 | Bofors 37 mm | Sweden | 1930s |
| 37 | 37 SA 18 | World War I / World War II | |
| 37 | 37 SA 38 | World War II | |
| 37 | 37 mm Gun M3 | World War II | |
| 37 | 37mm Gun M5/M6 | World War II | |
| 37 | 37 mm Vickers-Terni L/40 | 1930’s | |
| 37 | 3.7 cm KwK 36 L/45 | Nazi Germany | World War II |
| 40 | QF 2 pounder | World War II | |
| 45 | 20K/Model 32/35/38 | 1930s / World War II | |
| 47 | OQF 3 pounder gun Vickers Medium tanks | 1920s-1930s | |
| 47 | 47 SA 34 | pre-World War II | |
| 47 | 47 SA 35 | World War II | |
| 47 | Type 1 47 mm | Empire of Japan | World War II |
| 47 | Cannone da 47/32 & 47/40 | World War II | |
| 50 | 5 cm KwK 38 | Nazi Germany | World War II |
| 50 | 5 cm KwK 39 | Nazi Germany | World War II |
| 57 | QF 6 pounder Hotchkiss | World War I | |
| 57 | QF 6 pounder 6 cwt Hotchkiss | World War I | |
| 57 | Cockerill-Nordenfelt "Canon de caponnière" A7V's gun | World War I | |
| 57 | QF 6 pounder 7 cwt | World War II | |
| 57 | Type 97 57 mm | Empire of Japan | World War II |
| 57 | ZiS-4 | World War II | |
| 75 | 75 SA 35 | World War II | |
| 75 | 7.5 cm KwK 37 | Nazi Germany | World War II |
| 75 | Ordnance QF 75 mm | World War II | |
| 75 | Type 3 75 mm | Empire of Japan | World War II |
| 75 | Type 5 75 mm | Empire of Japan | World War II |
| 75 | 7.5 cm KwK 40 | Nazi Germany | World War II |
| 75 | 7.5 cm KwK 42 | Nazi Germany | World War II |
| 75 | 75mm Gun M2/M3/M6 | World War II | |
| 76.2 | Ordnance QF 3 inch howitzer | World War II | |
| 76.2 | Ordnance QF 17 pounder | World War II | |
| 76.2 | 77 mm HV | World War II | |
| 76.2 | Model 27/32 howitzer | 1930s | |
| 76.2 | L-10 | 1930s | |
| 76.2 | L-11 | World War II | |
| 76.2 | F-32 | World War II | |
| 76.2 | F-34/ZiS-5 | World War II | |
| 76.2 | D-56T | Cold War | |
| 76.2 | 76mm Gun M1 | World War II | |
| 76.2 | 3in Gun M7 | World War II | |
| 84 | Ordnance QF 20 pounder | Cold War | |
| 85 | D-5T | World War II | |
| 85 | ZiS-S-53 | World War II | |
| 88 | KwK 36 | Nazi Germany | World War II |
| 88 | KwK 43 L71 | Nazi Germany | World War II |
| 90 | 90mm Gun M3 | World War II | |
| 90 | GIAT CN90F1 | Cold War | |
| 94 | Ordnance QF 32 pounder | World War II | |
| 100 | D-10T | World War II / Cold War | |
| 105 | 105mm Howitzer M4 | World War II | |
| 105 | AMX CN-105 F1 | Modern | |
| 105 | L7 | Cold War | |
| 105 | Rheinmetall LTA2 | Cold War | |
| 115 | U-5TS/2A20 | Cold War | |
| 120 | Rheinmetall L44/M256 | Cold War | |
| 120 | Rheinmetall L55 | Modern | |
| 120 | MG251/MG253 | Cold War | |
| 120 | L11A5 | Cold War | |
| 120 | L30 | Cold War/Modern | |
| 120 | GIAT CN120-26/52 | Cold War/Modern | |
| 120 | KBM2 | Modern | |
| 122 | D-25T | World War II | |
| 125 | D-81T/Sprut anti-tank gun | Cold War | |
| 125 | KBA3 | Modern | |
| 128 | 12.8 cm Pak 44 | Nazi Germany | World War II |
| 152 | 152 mm M-10T | World War II | |
| 152 | 152 mm M81, M81E1 Gun/Launcher | Vietnam / Cold War |