Roosville, British Columbia, Canada is a tiny farming community bordering the U.S. state of Montana near Lake Koocanusa, at the southeast corner of Tobacco Plains Indian Reserve No. 2. The Roosville border crossing is a primary entry into Southeast British Columbia from Northwest Montana. The name of this community derives from the family Roo, early settlers in the area. The name was conferred in honour of a Roo family member who was postmaster .
The community in Montana, across the Canada–United States border, is also named Roosville, as is the US port of entry.
The traditional name in the Ktunaxa language for this site is ¿/u¿/uqa, pronounced tsoo-tsoo-qa.