Emperor Meiji, (明治天皇, Meiji-tennō, 3 November 1852 – 30 July 1912) also called Meiji the Great (明治大帝, Meiji-taitei) or Meiji the Good, (明治聖帝, Meiji-seitei) was the 122nd emperor of Japan according to the traditional order of succession. Reigning from 3 February 1867 until his death on 30 July 1912, and the first monarch of the Empire of Japan, he presided over the Meiji era, and instigated the Meiji Restoration, a series of rapid changes that witnessed Japan's transformation from an isolationist, feudal state to an industrialized world power.

At the time of Emperor Meiji's birth in 1852, Japan was a feudal, pre-industrial country dominated by the isolationist Tokugawa shogunate and the daimyō subject to it, who ruled over the country's 270 decentralized domains. By the time of his death in 1912, Japan had undergone an extensive political, economic and social revolution, and emerged as one of the great powers on the world stage. The New York Times summarized this transformation at the emperor's funeral in 1912 with the words: "the contrast between that which preceded the funeral car and that which followed it was striking indeed. Before it went old Japan; after it came new Japan."Since the modern era, when an emperor of Japan dies he is given a posthumous name. Such a name is a combination of the era during which he reigned and coincides with the emperor's contribution to the throne whilst he was alive. Therefore, while publicly known during his life merely as "The Emperor", he has been historically known as "Emperor Meiji" after his death. He obtained this current title in reference to the Meiji era, which spanned almost the entirety of his reign. His personal name (which is not used in any formal or official context, except for his signature) was Mutsuhito (睦仁).