Cydonie Mothersille, Jamaican-Caymanian sprinter
Cydonie Camille Mothersille (born 19 March 1978) is a female former track and field sprinter from the Cayman Islands. Her speciality at the beginning of her career was the 100 metres, while the 200 metres gradually became her main event. She represented her country at four Olympic Games from 1996 to 2008, six World Championships in Athletics, and three Commonwealth Games. Her greatest achievements were in the 200 m, including a bronze at the 2001 World Championships in Athletics, Commonwealth gold in 2010 and a silver at the 2003 Pan American Games. Her World Championship medal was the first ever for her nation.

Mothersille was born in Jamaica in 1978 and moved to Grand Cayman, Cayman Islands at age 7. While in high school, she was discovered by her high school's physical education teacher Evelyn Rockette and began her track career. Mothersille began competing for the Cayman Islands by competing in the CARIFTA Games, where she performed well with a 100/200 m sprint double in 1996. In 1996, she was awarded the Austin Sealy Trophy for the most outstanding athlete of the 1996 CARIFTA Games.While in college she competed in the 100 m, 200 m, 4 × 100 m relay and 4 × 400 m relay for Clemson University. She was a part of the Clemson All American 4 x 100 and 4 x 400 team.

In 2011, Cydonie was the highest paid athlete from the Cayman Islands (male or female) making $85,000 (USD). Mothersille is married to Ato Stephens.

Mothersille was coached by Henry Rolle.