net or net may refer to:

== Mathematics and physics ==
Net (mathematics), a filter-like topological generalization of a sequence
Net, a linear system of divisors of dimension 2
Net (polyhedron), an arrangement of polygons that can be folded up to form a polyhedron
An incidence structure consisting of points and parallel classes of lines
Operator algebras in Local quantum field theory

== Other ==
Net (command), an operating system command
Net (device), a grid-like device or object such as that used in fishing or sports, commonly made from woven fibers
Net (textile), a textile in which the warp and weft yarns are looped or knotted at their intersections
Net (economics) (nett), the sum or difference of two or more economic variables
Net income (nett), an entity’s income minus cost of goods sold, expenses and taxes for an accounting period
In electronic design, a connection in a netlist
In computing, the Internet
In golf, the net score is the number of strokes taken minus any handicap allowance

== See also ==
NET (disambiguation)
Nett, a municipality in the Federated States of Micronesia
net sports, sports that use a net
ε-net (computational geometry), a mathematical concept whereby a general set is approximated by a collection of simpler subsets
.net (disambiguation)
Network (disambiguation)
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