Tree diagram

Tree diagram may refer to:
 * Tree structure, a way of representing the hierarchical nature of a structure in a graphical form

Mathematics and logic

 * Tree diagram (probability theory), a diagram to represent a probability space in probability theory
 * Decision tree, a decision support tool that uses a tree-like graph or model of decisions and their possible consequences
 * Event tree, inductive analytical diagram in which an event is analyzed using Boolean logic
 * Game tree, a tree diagram used to find and analyze potential moves in a game

Linguistics

 * Language tree, representation of a group of languages related through descent from a common ancestor
 * Parse tree, a representation of the syntactic structure of a string according to some formal grammar in linguistics
 * Sentence diagram, a pictorial representation of the grammatical structure of a sentence showing the relationships of phrase structures

Biology

 * Dendrogram, a tree diagram used to illustrate clusters of genes or samples in computational biology
 * Phylogenetic tree, a branching diagram showing the inferred evolutionary relationships among various biological species

Other uses

 * Attack tree, conceptual diagrams showing how a target might be attacked
 * Fault tree diagram, diagram used in deductive failure analysis in various industries
 * Program structure tree, hierarchical diagram that displays the organization of a computer program
 * Treemapping, a method for displaying hierarchical data using nested figures, usually rectangles.