Timberline or timber line has several meanings:
Tree line, the edge of a habitat at which trees are capable of growing,
Timberline Lodge, a National Historic Landmark mountain lodge and ski area in Oregon, U.S.
Timberline Lodge ski area, the ski area surrounding the lodge,
Timberline Software, owned by Sage Group since September 2003,
Timberline High School (Boise, Idaho),
Timberline High School (Weippe, Idaho),
Timberline High School (Lacey, Washington)