Doping in sport is the deliberate or inadvertent use by an athlete. 'Doping' is the word used in sport when athletes use prohibited substances or methods to unfairly improve their sporting performance. The utilization of such substances, their vicinity in urine or blood tests, and the utilization of systems with the motivation behind changing the after effect of an investigation of a urine or blood specimen are prohibited. Drug abuse might be destructive to an athlete’s health or to different competitors contending in the game. It extremely harms the uprightness, picture and worth of game, whether the cause to utilize medications is to enhance execution. Over two decades, the importance of coaches as potential agents in the prevention of drug use amongst athletes has been emphasised. This article examines the published evidence on coaches' knowledge, attitudes and beliefs towards doping in sport. A systematic search strategy was followed. Research questions and relevance criteria were developed a priori. Potentially relevant studies were located through electronic and hand searches limited to English language articles published between 1990 and Jan 2011. Articles were assessed for relevance by two independent assessors and the results of selected studies were abstracted and synthesised. Outcomes of interest were knowledge, attitudes and beliefs in relation to doping in sport.