Semiahmoo

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