Lüshunkou District or Lyushunkou District (simplified Chinese: 旅顺口区; traditional Chinese: 旅順口區; pinyin: Lǚshùnkǒu Qū) is one of six districts of Dalian, Liaoning province, People's Republic of China. Also called Lüshun City (旅顺市; 旅順市; Lǚshùn Shì) or (more literally) Lüshun Port (旅顺港; 旅順港; Lǚshùn gǎng), it was formerly known as both Port Arthur (亚瑟港; 亞瑟港; Yàsè Gǎng; Russian: Порт-Артур; Port-Artur) and Ryojun (Japanese: 旅順).