Harry Julian Allen | |
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 | |
| Born | April 1, 1910 |
| Died | January 29, 1977 (aged 66) |
| Nationality | American |
| Citizenship | U.S. |
| Occupation | Aeronautical engineer |
| Years active | 1936-1969 |
| Employer | Ames Research Center |
| Known for | Blunt Body theory |
Harry Julian Allen (April 1, 1910 – January 29, 1977), also known as Harvey Allen, was an aeronautical engineer and a Director of the NASA Ames Research Center, most noted for his "Blunt Body" theory of atmospheric entry which permitted successful recovery of orbiting spacecraft.[1] His technique is still used to this day.