Jan Kazimierz Umiastowski (died 1659) was a Polish szlachcic from family - comites Pierzchała-Umiastowski.
Life
He was District Writer of Brześć since 1648, District Judge and Podkomorzy (Chamberlain) of Brześć; since 1654.
<!-- son Jan Fabian, daughter Anna (husband Florian prince Sapieha) -->
Marshal of the Sejm (nadzwyczajnego) in 1655 in Warsaw.