| Hermann Vermeil | |
| Birth Date: | 1889 |
| Death Date: | 1959 |
| Nationality: | German |
| Fields: | Mathematics |
| Alma Mater: | Universität Leipzig |
| Doctoral Advisor: | Otto Ludwig Hölder |
| Known For: | Vermeil's theorem |
Hermann Vermeil (1889–1959) was a German mathematician who produced the first published proof that the scalar curvature is the only absolute invariant among those of prescribed type suitable for Albert Einstein’s theory. The theorem was proved by him in 1917[1] when he was Hermann Weyl's assistant.