Sieve may mean:

Cooking

• a colander
• a chinoise, or conical sieve

Mathematics

• sieve theory, technique for counting or filtering sets of numbers
  • sieve of Eratosthenes
  • general number field sieve
  • large sieve
• sieve (category theory), a way of writing down how objects in a category glue to give other ones

Computer science

• Sieve (mail filtering language), a proposed standard for specifying mail filters.

Other uses

• In metaphor and simile, sieve may often be used to refer to things that are leaky, as a sieve used for a bowl.
• On rivers, a sieve is a dangerous obstacle that water can pass through, but people cannot.

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