Utah State Route 15 (disambiguation)
Utah State Route 15 is the legislative overlay designation for Interstate (I-15) within Utah, United States, that runs from Arizona to Idaho (through Washington, Iron, Beaver, Millard, Juab, Utah, Salt Lake, Davis, Weber, and Box Elder counties)

Utah State Route 15 may also refer to:
 Utah State Route 15 (1912-1977), the former state highway designation for what is currently Utah State Route 9 in Washington and Kane counties in southern Utah, United States, that connects Interstate 15 in Washington with U.S. Route 89 in Mount Carmel Junction

See also
 List of state highways in Utah
 List of Interstate Highways in Utah
 List of highways numbered 15