Ding Yu (丁玉 Dīng Yù; ?–1380), born Ding Guozhen (丁國珍 Dīng Guózhēn), was a Chinese military general during the early Ming dynasty. He was a native of Hezhong (河中; present-day Shanxi).

In his early years, he followed Han Lin'er (韓林兒) and served as a censor. After Lu Zhen (呂珍) seized Anfeng, Ding Yu surrendered to Zhu Yuanzhang (the future Hongwu Emperor). After that, he participated in the campaign in Pengli, served as the prefect of Jiujiang. He also led the crowd to put down the Pengze rebellion (彭澤叛乱). Zhu Yuanzhang admired his military strategy, ordered Ding to concurrently serve as a commander (指揮), and changed his name to Yu. Later, he followed Fu Youde to conquer Hengzhou, served as vice commander (指揮同知) to guard Hengzhou, and later moved to defend Yongzhou.

In 1368, he was promoted to the rank of Military Commissioner-in-chief (都指揮使) and concurrently served as Assistant Administiontrator (行省參政), guarding Guangxi. In 1377, he became the Right Censor-in-chief (右御史大夫). Later, as a general of Pingqiang (平羌將軍), he put down the rebellion of Dong Tieli (董貼里), a native chieftain of Weimao, Sichuan. Two years later, he pacified Songzhou (松州; Songpan 松潘). At that time, the Hongwu Emperor believed that Songzhou was too mountainous and had few fields, so it was not suitable to retain. Ding Yu, however, believed that it was an important place in Western Qiang (西羌) and military facilities should not be abandoned. Therefore, the Hongwu Emperor followed his opinion. At that time, Peng Pugui (彭普貴), a native of Sichuan, rebelled, and commander Pu Liang (普亮) was unable to quell it; later, it was suppressed by Ding Yu. The Hongwu Emperor wrote a letter praising Ding Yu and awarding him the title of Left Censor-in-chief (左御史大夫). After the army returned, he was promoted to the Left Commissioner-in-chief of the Grand Chief Military Commission (大都督府左都督). In 1380, the Hu Weiyong case occurred, and Ding Yu was later executed due to his connection to Hu Weiyong through marriage.

丁玉（？ - 1380年），初名國珍，河中（今山西）人。明朝初期軍事將領。

其早年跟從韓林兒，擔任御史。呂珍攻破安豐後，丁玉歸降朱元璋。此後跟隨征戰彭蠡，擔任九江知府。並率眾平定彭澤叛亂。朱元璋讚賞其武略，命其兼任指揮，並改名為玉。之後跟從傅友德攻克衡州，並擔任指揮同知鎮守衡州，後移防永州。

洪武元年，晉升都指揮使，兼任行省參政，鎮守廣西。洪武十年，為右御史大夫。後以平羌將軍身份平定四川威茂土酋董貼里叛亂。兩年後，平定松州。當時朱元璋認為松州多山少田，不宜堅守。丁玉則認為其為西羌要地，不可放棄軍事設施。于是朱元璋聽從其主張。當時四川人彭普貴造亂，指揮普亮不能平定，之後丁玉討伐。明太祖寫書讚賞丁玉，並授其左御史大夫。後大軍返回，升任大都督府左都督。洪武十三年，胡惟庸案發，丁玉因與胡惟庸有姻親，之後連坐被殺。