Semiahmoo ( , ; 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: Semiahmoo people, a Coast Salish people Semiahmoo First Nation, government of the Semiahmoo people Semiahmoo Indian Reserve, the Indian Reserve of the Semiahmoo people Semiahmoo Peninsula, bounded by the waters of Semiahmoo Bay and Boundary Bay Semiahmoo Secondary School, public high school in Surrey, British Columbia Semiahmoo Shopping Centre, shopping mall in Surrey, resting directly against the border with White Rock Semiahmoo Trail Elementary School, public elementary school in Surrey
In the United States: Semiahmoo Resort, a major golf resort and spa near Blaine, Washington Semiahmoo, Washington, an unincorporated community in Washington Semiahmoo Harbor Light, lighthouse near Blaine, Washington