Gan Ning (died around 220) was a military general serving under the warlord Sun Quan during the late Han Dynasty period of Chinese history. He was born in Linjiang, Ba Commandery (present-day Zhong County, Chongqing).

As a youth, Gan served under the warlord Liu Yan but revolted when the latter died. After his rebellion failed, he led a band of bandits carrying bows and crossbows to wander the lands. They wore bells about their waists and bone ornaments in their hair as a mark, causing commoners to either run or hide when they heard the ring of bells. He kept looting, robbing and killing until he decided to pursue scholarly arts in his twenties. After reading some literary texts by different philosophers, Gan sought the warlord Liu Biao's patronage, but was rejected for his background.

Instead, he went to join Liu Biao's general Huang Zu, who was a local gentry and warlord of Jiangxia. Huang did not trust him and gave him an unworthy position. In an attack against Huang by Sun Quan's general, Ling Cao, at the Battle of Xiakou, Huang was nearly killed, and amidst the chaos and disarray, Gan fired a stray arrow that killed Ling, resulting in the safe retreat of Huang. However, the embarrassed Huang did not reward him nor respect him.

Niu Jin was a military general serving under the warlord Cao Cao during the late Han Dynasty period of Chinese history. He continued serving the state of Cao Wei during the Three Kingdoms period.

Niu participated in the Battle of Jiangling, during which he volunteered to lead 300 cavalry to attack the enemy, but was only saved by Cao Ren when he got surrounded.

Years later, he participated in the counter-attack against the invading Shu Han forces in 231 and scored a victory over Zhuge Liang's unit, and pursued him to Mount Qi. In 234, he soundly defeated the Shu Han general Ma Dai on the battlefield, and chopped off thousands of enemies' heads. In 238, he followed Sima Yi in his campaign against Gongsun Yuan, and was promoted to General of the Rear.

However, his accomplishments during his later years had only earned him the apprehension from the Simas, thus he was ordered to commit suicide by drinking poison.

In Luo Guanzhong's historical novel Romance of the Three Kingdoms, Niu was one of Cao Ren's subordinates. He chased Gan Ning back to Yiling during the battle of Jiangling, but was surrounded by reinforcements led by Zhou Yu, and was ultimately defeated. Niu then regrouped and planned a night attack on Zhou's camp, but in the end he was once again beaten, suffering another great loss.