Separator can refer to:

• A mechanical device to separate fluids and solids, like
  • Cream separator, separates cream from milk
  • Demister (vapor), removal of liquid droplets entrained in a vapor stream
  • Separator (oil production), of an oil production plant
  • Vapor-liquid separator, separates a vapor-liquid mixture
  • a machine used to produce mechanically separated meat
• The historic Swedish company name AB Separator, common ancestor of Alfa Laval and DeLaval
• Air classifier, a mechanical device to separate components of air
• Community separator, a term of urban planning
• Separator (electricity), a porous or ion-conducting barrier used to separate anode and cathode in electrochemical systems, also known as diaphragm
• Planar separator theorem, a theorem in graph theory
  • Vertex separator, a notion in graph theory
• Geometric separator, a line that separates a set of geometric shapes to two subsets
• A synonym for "generator" in category theory
• A mathematical sign used to separate the integer part from the fractional part of a number. For example, the decimal point and the binary point
• A synonym for "delimiter" in computer parlance
• Orthodontic spacer, also known as orthodontic separators
• Four of the C0 and C1 control codes used in digital character encoding
• A song by Radiohead, off the 2011 album The King of Limbs
• In computing, a Printer separator to flag the start and end of jobs on a printer