李知孝（?—?），字孝章，紹興府上虞（今浙江上虞東南）人。
李光之孫。嘉定四年進士，擔任丞相府主管文字。後依附史彌遠，與梁成大和莫澤三人合稱三凶。與詩人曾極有私怨，誣稱其作品《江湖集》中有「九十日春晴日少，一千年事亂時多」句，曲解為「誹謗」朝廷，曾極被殺[1]。
註釋
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