Port Arthur may refer to:

• Port Arthur, Tasmania (Australia), the site of a historic convict settlement
• Port Arthur, Texas a city in the (United States)
• Port Arthur, Ontario (Canada), a former city, now a part of Thunder Bay
• Port Arthur (electoral district) (Canada),
• VIII District, Turku (Finland), aka Port Arthur, a district in Turku
• Lüshunkou (China), a town formerly known as Port Arthur

• Battle of Port Arthur (Lüshunkou), in the Russo-Japanese War in 1904
• Port Arthur massacre (Australia), which occurred in Port Arthur, Tasmania in 1996
• Port Arthur massacre (China) (Lüshunkou) in the Sino-Japanese War in 1894
• Port Arthur, Battletech Universe's fictional planet

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