John Anthony Reder (born Lublin, Poland, September 24, 1909; died Fall River, Massachusetts, April 12, 1990) is a former Polish American sportsman who during the 1930s played soccer with the Fall River Marksmen and the New Bedford Whalers and baseball for the Boston Red Sox.
As a soccer goalkeeper he won three American Soccer League titles and two National Challenge Cup titles.
In 1935, while playing baseball for the Williamsport Grays, he was voted Most Valuable Player of the New York–Penn League.
Together with Moe Drabowsky, Nap Kloza and Henry Peploski, Reder is one of only four Major League Baseball players to be born in Poland.