| Duke Xian of Qin 秦憲公 | |
| Succession: | Ruler of Qin |
| Reign: | 715–704 BC |
| Predecessor: | Duke Wen of Qin |
| Successor: | Chuzi I |
| House: | Ying |
| Dynasty: | Qin |
| Father: | Duke Jing of Qin (秦竫公) |
| Spouse: | Lu Ji (魯姬) Wang Ji (王姬) |
| Issue: | Duke Wu of Qin (by Lu Ji) Duke De of Qin (by Lu Ji) Chuzi I (by Wang Ji) |
| Birth Date: | 725 BC |
| Death Date: | 704 BC (aged 21) |
| Posthumous Name: | Duke Xian (憲公) |
Duke Xian of Qin (725–704 BC), personal name unknown, was from 715 to 704 BC the monarch of the Qin state. His posthumous name was recorded as Duke Ning of Qin (秦寧公) in the Records of the Grand Historian by Western Han historian Sima Qian, but inscriptions on excavated bronzes from the era have proven that "Ning" (寧) was a miscopy of the correct character "Xian" (憲).[1]
Duke Xian succeeded his grandfather Duke Wen of Qin, who ruled for 50 years and died in 716 BC. Duke Xian was made the crown prince after his father predeceased Duke Wen in 718 BC. His father was given the posthumous title Duke Jing of Qin (秦竫公) although he never ascended the throne.[2]
In 714 BC, the second year of Duke Xian's reign, the Qin capital was moved to Pingyang (平陽, in present-day Baoji, Shaanxi). The next year Qin defeated the Rong state of Bo (亳), whose king escaped to the Rong homeland.[2]
In autumn 708 BC Qin attacked the minor state of Rui, but was defeated. Qin returned in winter with the army of King Huan of Zhou, defeated Rui, and captured Wan, Count of Rui.[3]
In 704 BC Qin annexed Bo. Duke Xian died in the same year, aged 21. He had three young sons: the eldest, later known as Duke Wu of Qin, was the crown prince. The second son, later known as Duke De of Qin, was born to the same mother, Lu Ji (鲁姬). However, the ministers Fuji and Sanfu deposed the crown prince and installed the youngest son, by Duke Xian's other wife Wang Ji (王姬), on the throne. The boy was only five years old and would become known as Chuzi.[2]