| Adam Freytag | |
| Birth Date: | 1608 |
| Birth Place: | Toruń, Polish–Lithuanian Commonwealth |
| Death Date: | 1650 |
| Death Place: | Kėdainiai, Polish–Lithuanian Commonwealth |
Adam Freytag (1608–1650) was a Polish military engineer, mathematician and physician. He is best known for his work Architectura militaris nova et aucta, the first manual of bastion fortifications of the so-called Old Dutch system, published in 1631. In 1633–1634, he served as a Polish military engineer in the Smolensk War.