Of the 200 different species of owl, these are the 10 largest ones. They all come from different classifications.
| Bird | Length (Inches) | Length (CM) |
| 1. Great Grey Owl | 33.1 | 84 |
| 2. Blakiston’s Fish Owl | 28.3 | 72 |
| 3. Snowy | 28 | 71 |
| 4. Eurasian Eagle-Owl | 27.6 | 70 |
| 5. Milky Eagle Owl | 26 | 66 |
| 6. Spot-Bellied Eagle-Owl | 25.6 | 65 |
| 7. Great Horned Owl | 25.2 | 64 |
| 8. Pel’s Fishing Owl | 24.8 | 63 |
| 9.Cape Eagle Owl | 24 | 61 |
| =Tawny Fish Owl | 24 | 61 |
