Melaine Walker O.D (born 1 March 1983, Kingston) is a Jamaican 400 metres hurdler. Walker is the former Olympic 400 m hurdles champion. She held the Olympic record of 52.64, set at the 2008 Beijing Olympics, and her time of 52.42 seconds at the 2009 World Championships in Berlin was the second fastest time in history at the time and still stands as one of the top five fastest times in history.
Walker is a past student of the St. Jago High School. She won Gold at the 2008 Beijing Olympics in a new Olympic record time of 52.64 seconds. Walker won the Jamaica national championships in 54.70 seconds, narrowly beating newcomer Kaliese Spencer and qualifying for her first World Championships in Athletics.
On 20 August 2009, she set the second fastest time in history of 52.42 seconds to win the women’s 400m hurdles final at the 2009 World Championships in Berlin. She leapt on the back of the mascot Berlino the Bear to do a victory lap but Berlino crashed into a cart of hurdles and dropped her.