Gillian Sanders (born 15 October 1981) is a South African triathlete.

She grew up in Pietermaritzburg, and took up triathlon in her youth under the influence of her father and older sister, who both competed in the sport.

After competing internationally in age group and junior competition Sanders put her triathlon career on hold whilst studying law at Stellenbosch University, where she competed as a 1500m runner.

She resumed triathlon competition after graduating, combining it with legal work.

Sanders chose to focus on full-time competition at the end of 2011.