Klein may refer to:
People
Places
- Klein (crater), a lunar feature
 - Klein, Montana, United States
 - Klein, Texas, United States
 - Klein (Ohm), a river of Hesse, Germany, tributary of the Ohm
 - Klein River, a river in the Western Cape province of South Africa
 
Business
- Klein Bikes, a bicycle manufacturer
 - Klein Tools, a manufacturer
 - S. Klein, a department store
 - Klein Modellbahn, an Austrian model railway manufacturer
 
Arts
- Klein + M.B.O., an Italian musical group
 - Klein Award, for comic art
 - Yves Klein, French artist
 
Mathematics
- Klein bottle, an unusual shape in topology
 - Klein geometry
 - Klein configuration, in geometry
 - Klein cubic (disambiguation)
 - Klein graphs, in graph theory
 - Klein model, or Beltrami–Klein model, a model of hyperbolic geometry
 - Klein polyhedron, a generalization of continued fractions to higher dimensions, in the geometry of numbers
 - Klein surface, a dianalytic manifold of complex dimension 1
 
Other uses
- Kleins, Lineman's pliers, a hand tool used by electricians and others
 - Klein Technique, a movement/dance technique developed by Susan Klein and studied by Garry Stewart
 
See also
- Kleine, a surname
 - Kline (disambiguation)
 - Cline (disambiguation)
 
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