Cheonggu (Korean: 청구; Hanja: 靑丘, 靑邱; RR: Cheonggu) also rendered as Qingqiu in Chinese, was a name given by ancient China to the Korean peninsula during the Gojoseon period to the Three Kingdoms period of Korea.

The origin of the name is unknown with many historians speculating that the letter "Cheong (靑)" meaning "azure" or "clear" often alluded to the cardinal direction, east (see Color in Chinese culture) with "Gu (丘)" meaning "hills" or "land". Therefore, the name would have most likely meant "Azure Land" in the east of China.

Another variation of its spelling can be found in Korean historical texts under "靑邱 (Cheonggu/Qingqiu)", most likely a way to prevent naming taboo of Confucius, born Kong Qiu (孔丘) which shares the letter "丘 (Qiu/Gu)".

The first ever mention of the name "Cheonggu" is found in Shanhaijing (Classic of Mountains and Seas), compiled from the Warring States period to the Western Han period of ancient China. Lüshi Chunqiu also notes that Cheonggu lies in the east of China as a foreign land.

『靑丘國在其北其人食五穀衣絲帛其狐四足九尾。』

"The Land of Blue Hills (Cheonggu) lies to the north where the inhabitants consume the Five Grains, wear silk and worship foxes that have four legs and nine tails."

— Shanhaijing

『亦有青丘國在海外水經云。』