Charles Alan Blake Clemetson FRCOG, FRCSC, FACOG (31 October 1923 – 30 August 2006) was a medical doctor, scientist and researcher who published over 48 medical papers and a three-volume monograph, Vitamin C. During his hospital and teaching career he specialised in obstetrics and gynecology. After retirement in 1991 he devoted his time to researching and publishing papers on Barlow's disease, hypothesizing this to be a cause of shaken-baby syndrome.