Ted Williams wore the number 9 for the Boston Red Sox.
Luis Aparicio wore #11 with the Boston Red Sox.
Steve Rodriguez Rico wore no. 6. Steve Rodriguez is right. Here's a list of who wore every number: http://www.redsoxdiehard.com/players/unifnums.html
Johnny Pesky wore number six. That number is now retired.
Tony Perez wore #5 for the Boston Red Sox.
Ted Williams wore #9 for the Boston Red Sox and that number has since been retired by the team.
Joe Cronin wore #4 for the Boston Red Sox in 1935 and again from 1937 to 1945. In 1936, he wore #6.
Click on the 'Red Sox Numbers' link on this page to see every player that wore every number in Red Sox history.
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That was Johnny Damon who wore #18 for the Red Sox between 2002-2005.
Mike Ryba, a pitcher, wore #20 for the Red Sox between 1942-1946.
Ted Williams wore uniform number 9 his entire career with the Boston Red Sox from 1939 - 1960.