《郑文公碑》，即《魏兖州刺史郑羲碑》，北魏摩崖刻石，北魏宣武帝永平四年（公元511年），郑道昭为了纪念其父所刻。书写者是郑羲的儿子郑道昭。当时郑道昭是兖州刺史，刚开始刻在天柱山巅，后来发现掖县南方云峰山的石质较佳，又再重刻。第一次刻的就称为上碑，字比较小，因为石质较差，字多模糊；第二次刻的便称为下碑，字稍大，且也精晰，共有五十一行，每行二十九字，但并没有署名，直至阮元亲临摹拓，且考订为郑道昭的作品后才受至重视。

郑文公碑的笔画有方也有圆，或以侧得妍，或以正取势，混合篆势、分韵、草情在一体，刚劲姿媚于一身，堪称不朽。结体宽博，气魄雄伟。清代包世臣说：“北碑体多旁出，郑文公字独真正，而篆势分韵草情毕具其中。布白本乙瑛，措画本石鼓，与草同源，故自署曰草篆。不言分者，体近易见也。”是“真文苑奇珍也”。

郑昭道（公元455—516年）北魏书家。字僖伯，自称中岳先生。荥阳（今属河南省）人。官国子祭酒、光州刺史，后人秘书监，谥曰文恭。工书善正书，体势高逸，作大字尤佳。

《郑文公碑下碑》初拓本

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《郑文公碑》集众体之长，有篆书的笔法，隶书的体势，行书的纵逸风姿，又有楷书的端庄。其用笔，既有篆法圆转形成的圆笔印象，又有隶法方折形成的方笔感受。方圆兼备，变化多端，雍容大雅。或以侧得妍，或以正取势，混合篆势、分韵、草情在一体，刚劲姿媚于一身，堪称不朽。

此碑雄浑凝重，为书家所重。如包世臣、龚自珍都将它同南碑之冠的《瘗鹤铭》相提并论。欧阳辅评此碑说：“笔势纵横而无莽野狞恶之习，下碑尤瘦健绝伦。”叶昌炽更谓“其笔力之健，可以刲犀兕，搏龙蛇，而游刃于虚，全以神运。唐初欧虞褚薛诸家，皆在笼罩之内，不独北朝第一，自有真书以来，一人而已”。又说：“余谓郑道昭，书中之圣也。”近人祝嘉先生的评价是：“其成就决不在王羲之之下，应奉为北方书圣，与王羲之并尊。”钟致帅《雪轩书品》中说“云峰魏碑，承汉隶之余韵，启唐楷之先声。不失为一代名作，无愧于千古佳品。”《郑文公碑》正是从隶书向楷书过渡时期，笔势尚有隶意，也出现了楷书笔法。清代包世臣谓此碑篆势、分韵、草情毕具，有“云鹤海鸥之态”,是魏碑书法艺术的代表作之一。包世臣说：“北碑体多旁出，郑文公字独真正，而篆势分韵草情毕具其中。布白本乙瑛，措画本石鼓，与草同源，故自署曰草篆。不言分者，体近易见也。”是“真文苑奇珍也”。而康有为在看过“郑文公碑”后说，如果谁没有见过此碑，就没有资格谈论书法。在清代，已成为“碑学”魏碑体不可多得的珍宝。如论南北两派之代表作，则是南梁《瘗鹤铭》、北魏《郑文公碑》，同是摩崖山书，风格相似，可谓南北双星。清人龚自珍诗云：“欲与此铭（指《瘗鹤铭》）分浩逸，北朝差许郑文公。”北派书写者多为庶人，书不具名，故书法史称北魏书法为民间书法，若以名而论，当推郑道昭父子为一时冠冕，被誉为“书中之圣”、北派王右军。

康有为曾誉《郑文公》为“魏碑圆笔之极轨”。从拓本看，此碑的用笔确很浑圆，但看原石，实方笔居多。给人以圆笔感觉是因为它属摩崖。