Port Arthur may refer to:
Places
Australia
Port Arthur, Tasmania, the site of a historic convict settlement
Port Arthur massacre (Australia), which occurred in Port Arthur, Tasmania in 1996
Port Arthur, South Australia, a locality
Canada
Port Arthur, Ontario, a former city, now a part of Thunder Bay
Port Arthur (federal electoral district)
China
Port Arthur, China, now called Lüshunkou District, in the city of Dalian
Port Arthur massacre (China) in the Sino-Japanese War in 1894
Battle of Port Arthur, a sea battle in the Russo-Japanese War in 1904
Siege of Port Arthur, a land battle in 1904
Finland
VIII District, Turku, a district in Turku
United States
Port Arthur, Texas, a city in the United States
Port Arthur, Wisconsin, an unincorporated community
Movies
Port Arthur (film), a 1936 drama film directed by Nicolas Farkas
Games
Port Arthur (wargame), a 1977 board wargame that simulates the 1904 Siege of Port Arthur