| William Henry Allen | |
| Order: | 2nd |
| President of the Pennsylvania State University | |
| Term Start: | 1864 |
| Term End: | 1866 |
| Birth Date: | March 27, 1808 |
| Birth Place: | Readfield, Maine, US |
| Death Place: | Philadelphia, Pennsylvania, US |
| Predecessor: | Evan Pugh |
| Successor: | John Fraser |
| Alma Mater: | Bowdoin College |
| Signature: | Signature of William Henry Allen (1808–1882).png |
William Henry Allen (March 27, 1808 – August 29, 1882) was an American professor and academic administrator. A graduate of Bowdoin College, he served as acting president of Dickinson College from 1847 until 1848, and later was selected as the second president of the Pennsylvania State University, serving from 1864 until 1866. He was elected to the American Philosophical Society in 1858.[1]