Betweenness is a noun derived from the proposition between. It may refer to: * The ternary relation of intermediacy or betweenness, a feature of ordered geometry. * Betweenness problem - an algorithmic problem. The input is a collection of ordered triples of items; the task is to decide whether there is a single total order such that such that, for each of the given triples, the middle item in the triple appears in the output somewhere between the other two items. * Betweenness centrality - a measure of centrality in a graph, based on shortest paths. The betweenness centrality of a vertex is the number of shortest paths that pass through the vertex. * Metric betweenness - given a metric ''d'', a point ''y'' is said to be ''between'' ''x'' and ''z'' if all three points are distinct, and d(x,y)+d(y,z)=d(x,z). See convex metric space.

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