The Chien-Cheng Circle (Chinese: 建成圓環; pinyin: Jiànchéng Yuánhuán; Pe̍h-ōe-jī: Kiàn-sêng Îⁿ-khoân) or Taipei Circle (Chinese: 臺北圓環; pinyin: Táiběi Yuánhuán; Pe̍h-ōe-jī: Tâi-pak Îⁿ-khoân), is a , on whose site was a former traffic circle, within which a former bustling landmark night market operated, in Datong District, Taipei, Taiwan.