Combat tanks, armored all-terrain fighting vehicles, revolutionized the way we fight when introduced during the First World War. Since then, despite some commentators predicting the end of the tank era, they remain a cornerstone of 21st century armies. The ranking includes main battle tanks and also more lightly-armed medium and light tanks. The numbers do not include armored personnel carriers or infantry fighting vehicles.
Here are the top 20 largest fleets of combat tanks in the world.
| Rank | Country | Combat tanks |
| 1. | Russia | 14,777 |
| 2. | North Korea | 5,845 |
| 3. | Egypt | 5,340 |
| 4. | China | 5,000 |
| 5. | United States | 4,657 |
| 6. | India | 4,614 |
| 7. | Pakistan | 3,742 |
| 8. | Syria | 2,720 |
| 9. | South Korea | 2,501 |
| 10. | Turkey | 2,231 |
| 11. | Vietnam | 2,029 |
| 12. | Iran | 1,996 |
| 13. | Ukraine | 1,777 |
| 14. | Eritrea | 1,756 |
| 15. | Algeria | 1,632 |
| 16. | Morocco | 1,564 |
| 17. | Saudi Arabia | 1,485 |
| 18. | Israel | 1,370 |
| 19. | Greece | 1,365 |
| 20. | Jordan | 1,365 |
