| Jan Kazimierz Umiastowski | |
| Coa: | Roch III |
| More: | no |
| Spouse: | Halszka princess Ogiński |
| Spouse-Type: | Consort |
| Noble Family: | Umiastowski |
| Father: | Jan comes von Nandelstädt Umiastowski |
| Death Date: | 1659 |
Jan Kazimierz Umiastowski (died 1659) was a Polish szlachcic from family - comites Pierzchała-Umiastowski.
He was District Writer of Brześć since 1648, District Judge and Podkomorzy (Chamberlain) of Brześć; since 1654.
Marshal of the Sejm (nadzwyczajnego) on May 19, - June 20, 1655 in Warsaw.