Lethbridge is a city in the province of Alberta, Canada. With a population of 106,550 in the 2023 municipal census, Lethbridge became the fourth Alberta city to surpass 100,000 people. The nearby Canadian Rocky Mountains contribute to the city's warm summers, mild winters, and windy climate. Lethbridge lies approximately 215 km (134 mi) southeast of Calgary on the Oldman River, 169 km (105 mi) west of Medicine Hat, and 105 km (65 mi) northwest of the Canada–United States border at the Sweetgrass–Coutts Border Crossing.