Christine Day (born 23 August 1986) is a Jamaican sprinter who specializes in the 400 metres. She represented Jamaica at the 2012 Summer Olympics in the individual 400m and in the 4×400 metre relay. Day was eliminated in the semifinals of the individual 400m but she and teammates Rosemarie Whyte, Shericka Williams and Novlene Williams-Mills won bronze in the relay.
Day won a bronze medal at the 2014 Glasgow in the women’s 400m behind teammates Stephanie McPherson and Novlene Williams-Mills. She along with Williams-Mills, McPherson and Anastasia Le-Roy won gold in the 4 x 400 metres women team and helped them in setting a games’ record of 3 minutes 23.82 seconds (3:23.82) at the 2014 Commonwealth Games.