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The traditional East Asian calendars divide a year into 24 solar terms (節氣). Lìqiū (pīnyīn) or Risshū (rōmaji) (Chinese and Japanese: 立秋; Korean: 입추; Vietnamese: Lập thu; literally: "start of autumn") is the 13^th solar term. It begins when the Sun reaches the celestial longitude of 135° and ends when it reaches the longitude of 150°. It more often refers in particular to the day when the Sun is exactly at the celestial longitude of 135°. In the Gregorian calendar, it usually begins around August 7 and ends around August 23.

Liqiu signifies the beginning of autumn in East Asian cultures.