Dario David Cioni (born 2 December 1974) is a retired English-born Italian professional road bicycle racer.

He continued with similar results through his mountain bike career, with several top five placings at World Cup events including second at St. Wendel in 1996.

His intention was to use the training on the road to help his mountain bike career with the specific aim of riding for Italy at the 2000 Summer Olympics.

Cioni was subsequently chosen to represent Italy at the World Cycling Championships, however, was not allowed to complete when he registered a hematocrit level over 50%.

In 2004, Cioni graduated from the European School of Economics with an honours degree in International Business with specialisation in Sports Management.