Katherine Leigh Copely (born January 9, 1988) is an American ice dancer who competed internationally for Lithuania.
With partner Deividas Stagniūnas, she is the 2007 Lithuanian national champion and 2006 & 2007 Golden Spin of Zagreb bronze medalist.
Copely teamed up with Duke Wensel in 2002. They competed until 2004 on the novice and junior levels. From 2004 to 2006, Copely skated on the junior level with Patrick Connelly. She teamed up with Stagniunas in 2006 to compete for Lithuania. They were unable to compete at the 2010 Winter Olympics because she was not granted Lithuanian citizenship.