Isabeli Bergossi Fontana (born July 4, 1983) is a Brazilian model.

Fontana was born in Curitiba, Paraná, Brazil. In 1996 she made it to the finals of the Elite Model Look when she was just 13 and in the following year she moved from Southern Brazil to Milan, Italy, to start her modelling career.

In 1999, at the age of 16, she appeared in the Victoria's Secret lingerie catalogue. The shoot caused controversy, as Victoria's Secret stated that they would not use girls younger than 21.[citation needed] Soon after the Victoria's Secret shoot, she was signed by Versace, Ralph Lauren and Valentino.

Since 1999 she has modeled for Sports Illustrated Swimsuit Issue, Marie Claire, ELLE, Vogue, Harper's Bazaar, Numéro, i-D, Arena and many others.

Fontana has been the face of a variety of advertising campaigns including Armani Jeans, Chanel, Colcci, Disritmia, Emporio Armani, Enrique Martinez, Helena Rubinstein, Hugo Boss, Hussein Chalayan, Massimo Dutti, M. Officer, Nicole Farhi, Oscar de la Renta, Peter Hahn, Philips, Ralph Lauren, Revlon, Roberto Cavalli, Rosa Chá, Saks Fifth Avenue, Tommy Hilfiger, Triton, Valentino, Versace, Victoria's Secret, Vivara and others.

Currently Isabeli can be seen in the F/W campaigns for Versace, Roberto Cavalli Valentino & H&M

Isabeli is the current face of Viktor & Rolf's fragrance Flowerbomb.

In 2008, she made her debut on the Forbes The World's 15 Top-Earning Models list at place 11, having earned $3 million

As a youth Isabeli attended the Church of Jesus Christ of Latter-day Saints in the Portão district of Curitiba. She was married to model Álvaro Jacomossi but they divorced in 2004. Their son, Zion, was born in 2003. Fontana married actor and model Henri Castelli on December 10, 2005 and their son, Lucas, was born on October 23, 2006 in São Paulo. Fontana and Castelli are separated now and are in the process of divorcing.