大正是日本大正天皇在位期间使用的年号，时间为1912年7月30日至1926年12月25日。

「大正」一词出自《易经》第十九卦中的「临，刚浸而长。说而顺，刚中而应，大亨以正，天之道也。」大正这一年号过去曾四次被选为候补，于明治改元时被采用。按《大正天皇实录》，同时尚有「天兴｣｢兴化｣为元号后补，而采「大正」为用。

The Taishō period(大正時代,Taishō jidai), or Taishō era, is a period in the history of Japan dating from July 30, 1912, to December 25, 1926, coinciding with the reign of the Emperor Taishō. The new emperor was a sickly man, which prompted the shift in political power from the old oligarchic group of elder statesmen (or genrō) to the Diet of Japan and the democratic parties. Thus, the era is considered the time of the liberal movement known as the "Taishō democracy" in Japan; it is usually distinguished from the preceding chaotic Meiji period and the following militarism-driven first part of the Shōwa period.