The finial is an architectural device, typically carved in stone and employed to decoratively emphasise the apex of a gable, or any of various distinctive ornaments at the top, end, or corner of a building or structure. Smaller sized finials can be used as a decorative ornament on the ends of curtain rods or applied to chairs and furniture. These are frequently seen on top of bed posts or clocks.

The finial can also function as a lightning rod, and was once believed to act as a deterrent to witches on broomsticks attempting to land on one's roof. On making her final landing approach to a roof, the witch, spotting the obstructing finial, was forced to veer off and land elsewhere.