| Role | Biplane fighter-bomber |
|---|---|
| Manufacturer | Heinkel |
| Designer | Günter brothers |
| First flight | May 1933 |
| Introduction | July 1934 |
| Retired | 1939 (Luftwaffe) 1952 (Spanish Air Force) |
| Status | Retired |
| Primary user | Luftwaffe |
| Number built | 700 |
| Developed from | Heinkel He 49 |

The Heinkel He 51 was a German single-seat biplane fighter aircraft. A seaplane variant and a ground-attack version were also developed. It was a development of the earlier He 49..
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The He 51 lasted in front-line service with the Luftwaffe until 1938, when it was relegated to use as an advanced trainer duties with the Jagdfliegerschulen[14] for the first few years of World War II.
The He 51 C-1 is a German biplane fighter
The modification He 51B-1 which had provision for a drop tank was produced since 1936.