Cassandra "Cassie" Jackman MBE (born 22 December 1972 and competing in some years as Cassie Campion) is a former English squash player who won the World Open in 1999. She was England's leading player throughout much of the 1990s and early 21st century. She retired due to a recurring back injury in December 2004. Jackman was appointed Member of the Order of the British Empire (MBE) in the 2004 Birthday Honours for services to squash.