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.
Marshal of the Sejm (nadzwyczajnego) in 1655 in Warsaw.Władysław Konopczyński , Chronology of Polish Sejms 1493–1793, Kraków 1948, p. 153.
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