Juan Ignacio Chela (born August 30, 1979, Buenos Aires, Argentina) is a professional male tennis player from Argentina. His strongest surface is slow hardcourt, but like most Argentine players he is comfortable on clay.

Chela was suspended by the ATP in 2001 for 3 months and US$ 8,000 for the use of Methyltestosterone during the Cincinnati Masters.

On August 9, 2004 he reached his career-high singles ranking of World No. 15.

Chela was involved in a spitting controversy during a third round loss to Lleyton Hewitt in the Australian Open in 2005, when he attempted to spit at Hewitt.

As part of the Argentine team for the Davis Cup, he holds a record of 6 victories and 4 losses, the most important of his victories on April 2006, giving Argentina the third point to beat defending champion Croatia in quarterfinals.

In May 2007, he appeared in the quarterfinals of his 6th different Masters event at Rome, also his personal best showing at Rome, with wins over Marc Gicquel, Igor Andreev, and world #3 Andy Roddick, the latter one being Chela's best ever victory since defeating #3 Yevgeny Kafelnikov in round 2 of Mallorca in in May 2000.

His trainer and fitness coach (and also a close friend) is Fernando Aguirre.