公孙龙（前320年－前250年），东周战国时期赵国人，传说字子秉，曾经做过平原君的门客，是名家的代表人物，以「白马非马」和「离坚白」等论点而著名。其主要著作为《公孙龙子》，西汉时共有14篇，唐代时分为三卷，北宋时遗失了8篇，到目前只残留6篇，共一卷，保存在明代《道藏》中。该书流传情况复杂，宋代以后有人怀疑它的真实性，认为今本《公孙龙子》是晋朝人根据零碎材料编纂起来的，在一定程度上失去了先秦《公孙龙子》的本来面目。《公孙龙子》第一章《迹府》描述其生平事迹。第二章《白马论》提出「白马非马」，讨论概念之间相等和包含的关系，和现代集合论思想有共通之处。第三章《指物论》提出「物莫非指」，讨论现实世界和主观概念的关系。第四章《通辩论》提出「鸡足三」，第五章《坚白论》，提出「离坚白」，讨论的是物体和物体的属性的关系。第六《名实论》。

Gongsun Long (simplified Chinese:公孙龙; traditional Chinese:公孫龍; pinyin:Gōngsūn Lóng; Wade–Giles:Kung-sun Lung, c.325–250 BC) was a member of the School of Names (Logicians) of ancient Chinese philosophy. He also ran a school and enjoyed the support of rulers, and advocated peaceful means of resolving disputes in contrast to the wars which were common in the Warring States period. However, little is known about the particulars of his life, and furthermore many of his writings have been lost. All of his essays — fourteen originally but only six extant — are included in the anthology the Gongsun Longzi (Chinese:公孫龍子; pinyin:Gōngsūn lóng zi; Wade–Giles:Kung-sun Lung-tzu).