{{wiktionary|complex|complexes}} '''Complex''' commonly refers to:
* Complexity, the behaviour of a system whose components interact in multiple ways so possible interactions are difficult to describe ** Complex system, a system composed of many components which may interact with each other * Complex (psychology), a core pattern of emotions etc. in the personal unconscious organized around a common theme such as power or status
'''Complex''' may also refer to: {{TOC right}} ==Arts, entertainment and media== * Complex (English band), formed in 1968, and their 1971 album ''Complex'' * Complex (band), a Japanese rock band * ''Complex'' (album), by Montaigne, 2019, and its title track * ''Complex'' (EP), by Rifle Sport, 1985 * "Complex" (song), by Gary Numan, 1979 * "Complex", a song by Katie Gregson-MacLeod, 2022 * "Complex" a song by Be'O and Zico, 2022 * Complex Networks, publisher of the now-only-online magazine ''Complex''
==Biology== * Protein–ligand complex, a complex of a protein bound with a ligand * Exosome complex, a multi-protein intracellular complex * Protein complex, a group of two or more associated polypeptide chains * Species complex, a cluster of very similar species difficult to delimit * Pre-Bötzinger complex, a cluster of interneurons in the ventral respiratory group of the medulla of the brainstem
==Chemistry== * Coordination complex, a central atom or ion and a surrounding array of bound molecules or ions * Chelate complex, a coordination complex with more than one bond
==Mathematics== * Complex number, an extension of real numbers obtained by adjoining imaginary numbers * Complex, an element of a field of sets * Chain complex, an algebraic structure * Simplicial complex, a kind of topological space * CW complex, a kind of topological space * Line complex, a 3-dimensional family of lines in space * Complex analysis, mathematical analysis of functions of variables which can be complex numbers
==Geology== * Complex (geology), a unit of rocks composed of rocks of two or three types * Complex crater, a type of large impact crater morphology * Volcanic complex, a group of volcanoes * Complex volcano, a volcano of mixed form * Accretionary complex, a fossil accretionary wedge
==Other uses == * Building complex, a group of inter-related buildings ** Housing complex, specifically residential ** Market complex, group of stores or business firms in a marketplace having common walkway(s), usually enclosed within a boundary or situated under one roof * UCL Centre for Mathematics and Physics in the Life Sciences and Experimental Biology (CoMPLEX), part of UCL Faculty of Mathematical and Physical Sciences, London, UK
==See also== {{srt}} * Complexity (disambiguation) * Complexity theory (disambiguation) * Military–industrial complex
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