John Barcoski (also spelled as Barkoski, Borkovski, or Barkowsky; December 15, 1889 – February 10, 1929) was a Polish émigré miner brutally beaten to death by Pennsylvania's Coal and Iron Police on February 10, 1929. His passing and subsequent acquittal of his murderers on the first-degree murder charges provoked public indignation, which eventually led to the end of Pennsylvania's private anti-labor Coal and Iron Police system.