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=== Mathematics and physics ===
* In [[theoretical physics]], a '''matrix model''' is a system (usually a [[quantum mechanics|quantum mechanical]] system) with [[matrix (math)|matrix]]-valued [[physical quantity|physical quantities]]. See, for example, [[Lax pair]].
* The "old" matrix models are relevant for [[string theory]] in two [[spacetime]] dimensions. The "new" matrix model is a synonym for [[Matrix theory (physics)|Matrix theory]].
* A concept from [[Algebraic logic]].▼
=== Biomedicine ===
* [[Matrix population models]] are used to model wildlife and human population dynamics.
* The Matrix Model of substance abuse treatment was a model developed by the Matrix Institute in the 1980s to treat [[cocaine]] and [[methamphetamine]] addiction.
* Protein complexes: A matrix model of protein complexes (unrealistically) predicts that all proteins in a complex interact with all other proteins.
▲* A concept from [[Algebraic logic]].
=== Management and economics ===
* The term "Matrix model" is used to describe [[Matrix management]] where each worker in an organisation has two managers, one "functional": managing their expertise, the other "executive": managing their work on an a project.
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