Tang Zi (fl. 200–262) was a military general of the state ofEastern Wu during theThree Kingdoms period (220–280) of China. In 258, he defected to Wu's rival state,Cao Wei, and became a general under Wei.

Tang Zi was from Licheng Commandery (利城郡; between southeast of present-dayLinshu County,Shandong and northwest of present-dayGanyu District,Lianyungang,Jiangsu). In 225, Cai Fang (蔡方) started a rebellion in Licheng Commandery, killed the commandery Administrator Xu Ji (徐箕), and nominated Tang Zi to be their leader. TheWei emperorCao Pi ordered Ren Fu (任福), Duan Zhao (段昭),Wang Ling andLü Qian (呂虔) to lead troops to suppress the revolt. After the Wei forces defeated the rebels and retook Licheng Commandery, Tang Zi fled south toWu via the sea and became a Wu military officer.

Between 235 and 236, Tang Zi participated in a campaign against the restiveShanyue tribes in Wu territories along with the Wu generalsLü Dai andWu Can. After the campaign, he was promoted to the rank of a general for his contributions. Later, he and Wu Can led 3,000 troops to attack the Shanyue led by Dong Si (董嗣) but could not overcome the enemy until reinforcements led by another Wu general,Zhou Fang, showed up. In 239, he joined Lü Dai in quelling a revolt by Liao Shi (廖式).

In 252, Tang Zi fought at theBattle of Dongxing against Wu's rival state,Wei, alongside other Wu generals such asLiu Zan,Lü Ju andDing Feng. He was promoted to General of the Vanguard (前將軍), granted imperial authority, and enfeoffed as a marquis for his achievements in the battle.

In 256, Tang Zi joinedWen Qin, Lü Ju, Liu Zuan (劉纂) andZhu Yi to resist a Wei invasion in the regions around the Huai and Si rivers (in present-dayAnhui). In the same year, after the Wu regentSun Jun died, Tang Zi sided with Sun Jun's cousinSun Chen in a power struggle and killed Lü Ju, thus clearing the way for Sun Chen to succeed Sun Jun as the regent of Wu.

In 257, when the Wei generalZhuge Dan starteda rebellion in Shouchun (壽春; present-dayShou County,Anhui), he sent his sonZhuge Jing as a hostage to Wu in exchange for support from Wu against Wei. In the following year, Sun Chen ordered Wen Qin, Tang Zi, Quan Yi (全懌), Quan Duan (全端), Wang Zuo (王祚) and others to lead 30,000 troops to Shouchun to assist Zhuge Dan in his rebellion against Wei forces led by the Wei regentSima Zhao. When the tide turned against Zhuge Dan by early 258, Zhuge Dan and Tang Zi tried to break out of the siege but failed. After being captured by Wei forces, Tang Zi agreed to surrender and defect to Wei. Sima Zhao appointed him as General Who Stabilises Distant Lands (安遠將軍). As Sima Zhao treated the surrendered Wu soldiers well, in return the Wu government did not harm Tang Zi's family members, who were still in Wu when he defected to Wei.

In 262, when Sima Zhao was planningan invasion of Wei's other rival state,Shu, he ordered Tang Zi to supervise the construction of warships to be used in a later campaign against Wu. Nothing about Tang Zi was recorded in history after that.

• Lists of people of the Three Kingdoms

• Chen, Shou (3rd century).Records of the Three Kingdoms (Sanguozhi).
• Pei, Songzhi (5th century).Annotated Records of the Three Kingdoms (Sanguozhi zhu).

• Eastern Wu generals
• Cao Wei generals
• People from Lianyungang
• Generals from Jiangsu

• Articles with short description
• Short description matches Wikidata
• Articles containing Chinese-language text
• Year of birth unknown
• Year of death unknown