Diane Ratnik-Cooper (born July 14, 1962 in TorontoOntario) is a retired female volleyball player from Canada, who competed for her native country in two Summer Olympics: 1984 and 1996. A resident of Scarborough, Ontario, she finished in 8th and 10th place with the Women's National Team.

Ratnik-Cooper is currently living in Uxbridge, Ontario and is a decorative painter. Her work can be seen at Josie's Joys, her business named in honour of her mother.

In January 2009, Diane was inducted into the University of Michigan Athletic Hall of Honor for her achievements on the 1981 Big Ten Championship volleyball team.

Currently she is enjoying informing people of the REAL FOOD REVOLUTION and encouraging them to take charge of their health.

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