1040s in Japan

was a after Chōgen and before Chōkyū. This period spanned the years from April 1037 through 1040. The reigning emperor was .

was a after Chōryaku and before Kantoku. This period spanned the years from November 1040 through November 1044. The reigning emperor was .

was a after Chōkyū and before Eishō, This period spanned the years from November 1044 through April 1046. The reigning emperors were and .

Japanese era from February 1046 to January 1053