Plumbline (disambiguation)

A plumbline is a string with a lead (Latin plumbum) weight (or plumb bob), used to provide a vertical reference line.

It may also refer to:

• The Plumbline, a joke newspaper produced by the McMaster Engineering Society
• Plumb Line, a film by Carolee Schneemann
• the vertical direction, a line orthogonal to the geoid, as used in geodesy