| ANT-21 (MI-3) | |
|---|---|
| Role | Fighter |
| National origin | Soviet Union |
| Manufacturer | Tupolev |
| First flight | 1933 |
| Number built | 2 |
| Developed from | Tupolev ANT-7 |
The Tupolev ANT-21 was a Soviet twin-engined four-seat heavy fighter, which also had the designation MI-3 (Mnogomestnyi Istrebitel – Multi-seat fighter). It was not accepted for production, only two prototypes being built.