贞治（1362年九月二十三日至1368年二月十八日）是日本北朝的年号之一。这个时代的北朝天皇是后光严天皇。

• 康安二年九月二十三日（1362年10月11日）改元贞治
• 贞治七年二月十八日（1368年3月7日）改元应安

Jōji(贞治) was a Japanese era name (年号, nengō, lit. year name) of the Northern Court during the Era of Northern and Southern Courts after Kōan and before Ōan. This period spanned the years from September 1362 through February 1368. The emperor in Kyoto was Emperor Go-Kōgon(后光厳天皇,Go-Kōgon-tennō). Go-Kōgon's Southern Court rival in Yoshino during this time-frame was Emperor Go-Murakami(后村上天皇,Go-Murakami-tennō)