Cassandra ("Cassie") Lily Patten (born 1 January 1987 at Cardinham, Cornwall, United Kingdom)[1][2] is a British freestyle swimmer and coach who won the bronze in the 10 km open-water event at the 2008 Beijing Olympics.

Patten was coached by Jon Rudd, Amanda Booth and Jo Johns in the highly successful Plymouth Leander Swimming programme at this time.

In her third year at the championships, which doubled as the 2008 Olympic trials, she won silver in the 800m freestyle and qualified to represent Team GB in this event.

She won a silver medal in the 10 km freestyle at the 2007 World championship, only three seconds behind Larisa Ilchenko, the gold medallist.

[1][2] Patten represented Great Britain at the 2008 Summer Olympics in the 800m freestyle and also in the 10 km open water swimming event, where she won a bronze medal.

Patten was the lead swimming pundit at the London Olympic Games for Sky Sports News in 2012 and commentated on the 10 km open water marathons in Hyde Park.