比赛造假意指在各种竞技或比赛，主办方或参赛者透过违反规则及体育精神的作为，人为操弄比赛成绩或结果（如放水），欺瞒其他参与活动的人及观众。

球模拟赛一般称为假球，香港称为打假波。粤语俚语称比赛造假为造马，即「制造马王」，初现于香港赛马活动中，其后被传媒引伸至应用于形容其他比赛，如各种颁奖礼或选美等。于饮食业上的解释是指，「造菜码」是指把食材预先处理好。例如牛肉切丁或牛肉切片的分类工作，方便厨师煮食，所以「造马」意思便是「整定」，而预先「整定」的赛果就是造码。

In organized sports, match fixing occurs as a match is played to a completely or partially pre-determined result, violating the rules of the game and often the law. There is a variety of reasons for this, but the most common is in exchange for a payoff from gamblers. Players might also intentionally perform poorly to get an advantage in the future, such as a better draft pick, or an easier opponent in a playoff. A player might also play poorly to rig a handicap system.