Semiahmoo (/ˌsɛmiˈɑːm/ SEM-ee-AH-moh, /ˌsɛmiˈɑːm/ SEM-ee-AH-moo; North Straits Salish: SEMYOME or səmyámə) may refer to:

  • Semiahmoo Bay, south-eastern section of Boundary Bay, bisected by the US-Canada border near White Rock, British Columbia

In Canada:

In the United States: