The Second Emperor of Qin (Chinese: 秦二世; pinyin: Qín Èrshì; Mandarin: [tɕʰǐn ɑ̂ɻ ʂɨ̂]; 229 – October 207 BCE) was the son of Qin Shi Huang and the second emperor of China's Qin dynasty. He ruled from 210 to 207 BCE.

Huhai (胡亥) was the personal name of the Second Emperor. Its Old Chinese pronunciation has been reconstructed as *Ga-gə′.

Although his parentage was questioned by many historians including Sima Qian, they accepted Qin Er Shi as a member of the Kingdom of Qin's House of Ying. The clan name of their branch of the dynasty was Zhao (趙). Although he is sometimes known as "Ying Huhai" according to the practice of modern Chinese names, the ancient custom was not to combine the names in this way: his personal name never appears in combination with Ying, Zhao, or Qin.

His regnal name Qin Er Shi () means "Second Generation of the Qin". It is a contraction of Qin Ershi Huangdi (), the "Second-Generation Emperor of the Qin". The name followed the nomenclature established by the First Emperor, who envisioned an empire that would last for ten thousand generations and for his successors to bear the aspiration in their reign names. The practice ended abruptly with the third emperor Ziying (子婴), when Qin dynasty was overturned by Chu and Han.

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