Marek Sobieski (24 May 1628 – 3 June 1652) was a Polish nobleman, starosta (tenant of the Crown lands) of Krasnystaw and Jaworów, and the older brother of King John III Sobieski of Poland. He graduated from Nowodworek College in Kraków and Kraków Academy, then traveled and studied in Western Europe. After returning to Poland in 1648 he fought against the Cossacks and Tatars at the Siege of Zbaraż and at the Battle of Beresteczko. He was taken captive by Tatars in 1652 and then killed by Cossacks.