Sully Osvaldo de Jesús Bonnelly Canaán (born December 24, 1956) is a Dominican-American fashion designer of women's ready-to-wear.

He studied architecture at UASD before moving to New York where he graduated from Parsons School of Design and began his career in fashion as Oscar de la Renta's assistant.

He then worked as a designer for the houses of Bill Blass and Eli Tahari before starting his namesake collection in 1998, retailing at Saks Fifth Avenue, Neiman Marcus, Bergdorf Goodman and other better stores around the world.

Most recently Bonnelly received the Orden al Merito Ciudadano, a recognition given to Dominicans all over the world who have distinguished themselves in their chosen careers and done honor to their homeland.

Past honorees include: the authors Junot Diaz and Julia Alvarez, the musician Michael Camilo and fashion designer Oscar de la Renta.

In January 2012, Sully Bonnelly married Robert Littman,[24] president of the Vergel Foundation, which manages a collection of modern and contemporary Mexican Art in New York and Cuernavaca, Mexico.