Horsefly, formerly known as Harper's Camp, is an unincorporated community in the Cariboo region of British Columbia, Canada. It is located between the Cariboo Mountains and Quesnel Lake. The Horsefly River and Horsefly Lake were given their names by the miners who came to the area during the Cariboo Gold Rush and were greeted by masses of pesky horseflies, but the village of Horsefly was known as Harper's Camp until approximately 1920 when it was changed to Horsefly.