Caroline Cheptanui Kilel is a Kenyan long-distance runner who specializes in road running competitions. She was the winner at the 2011 Boston Marathon and the Frankfurt Marathon in 2010 and 2013. Kilel took the silver medal in the marathon at the 2014 Commonwealth Games.

The 2011 Boston Marathon took place on Monday, April 18, 2011, as the 115th official running of the Boston Marathon. On October 18, 2010, the 20,000 spots reserved for qualifiers were filled in a record-setting eight hours and three minutes. Geoffrey Mutai of Kenya won the men's race in a time of 2:03:02.