| Model name | First flight | Number built | Type |
| Northrop Alpha | 1930 | 17 | Single-engine transport |
| Northrop C-19 Alpha | 1930 | 3 | Single-engine transport |
| Northrop Beta | 1931 | 2 | Single-engine sport airplane |
| Northrop Gamma | 1932 | 60 | Single-engine transport |
| Northrop Delta | 1933 | 13 | Single-engine transport, 19 additional aircraft built by Canadian Vickers |
| Northrop XFT | 1933 | 1 | Prototype naval fighter |
| Northrop YA-13 | 1933 | 1 | Prototype attack aircraft |
| Northrop A-17/Nomad | 1935 | 411 | Attack/light bomber |
| Northrop BT | 1935 | 55 | Dive bomber |
| Northrop N-1M | 1940 | 1 | Experimental flying wing |
| Northrop N-3PB | 1940 | 24 | Floatplane patrol bomber |
| Northrop P-61 Black Widow | 1942 | 706 | Night fighter |
| Northrop N-9M | 1942 | 4 | Experimental scale flying wing proof of concept for B-35 |
| Northrop XP-56 Black Bullet | 1943 | 2 | Prototype tailless fighter |
| Northrop F-15 Reporter | 1945 | 36 | Reconnaissance aircraft based on P-61 |
| Northrop XP-79 | 1945 | 1 | Prototype jet flying wing fighter |
| Northrop YB-35 | 1946 | 2 | Prototype strategic bomber |
| Northrop Pioneer | 1946 | 1 | Trimotor transport |
| Northrop YB-49 | 1947 | 6 | Prototype eight-jet-engine strategic bomber |
| Northrop F-89 Scorpion | 1948 | 1,052 | Interceptor |
| Northrop X-4 Bantam | 1948 | 2 | Experimental trans-sonic tailless aircraft |
| Northrop YC-125 Raider | 1949 | 23 | Trimotor transport |
| Northrop F-5 | 1959 | 2,246 | Lightweight fighter |
| Northrop T-38 Talon | 1959 | 1,146 | Advanced trainer |
| Northrop X-21 | 1963 | 2 | Experimental boundary layer control aircraft |
| Northrop M2-F2 | 1966 | 1 | Experimental rocket powered lifting body |
| Northrop HL-10 | 1966 | 1 | Experimental rocket lifting body |
| Northrop M2-F3 | 1970 | 1 | Experimental rocket lifting body |
| Northrop YA-9 | 1972 | 2 | Prototype attack aircraft |
| Northrop YF-17 | 1974 | 2 | Prototype fighter, led to F/A-18 |
| Northrop Tacit Blue | 1982 | 1 | Experimental stealth aircraft |
| Northrop F-20 Tigershark | 1982 | 3 | Prototype lightweight fighter derived from F-5 |
| Northrop B-2 Spirit | 1989 | 21 | Strategic stealth bomber |
| Northrop YF-23 | 1990 | 2 | Prototype stealth fighter |