Jianyuan may refer to:
Remonstrance Bureau (), a government agency during the Song and Jurchen Jin dynasties 建元 (literally "to establish an era name"), the first time an emperor (in Sinosphere) establishing an era name
Chinese era names
Jianyuan (140BC–135BC), era name used by Emperor Wu of Han Jianyuan (315–316), era name used by Liu Cong (Han-Zhao), emperor of Former Zhao Jianyuan (343–344), era name used by Emperor Kang of Jin Jianyuan (365–385), era name used by Fu Jian (337–385), emperor of Former Qin Jianyuan (479–482), era name used by Emperor Gao of Southern Qi