1020s in Japan

was a after Chōwa and before Jian. This period spanned the years from April 1017 through February 1021. The reigning emperor was .

Japanese era from 1021 to 1024

Japanese era from 1024 to 1028

was a after Manju and before Chōryaku. This period spanned the years from July 1028 through April 1037. The reigning emperors were and .