Joanne Amy Jackson (born 12 September 1986) is an English freestyle swimmer.

Jackson won the 400 m freestyle event at the 2003 European Short Course Swimming Championships.

[4] In the 2006 Commonwealth Games she won a silver medal in the 400 m freestyle event.

[8] On 16 March 2009 she set a new world record in the 400 m freestyle (long course) in a time of 4:00.66, beating her British rival and reigning Olympic gold medallist Rebecca Adlington in the process, who also broke the previous world record with a time of 4:00.89.

[9] On 26 July, she claimed silver in the 400-metre freestyle at the 2009 World Aquatics Championships, finishing behind Pellegrini but ahead of Adlington.