Affinity

Affinity may refer to:

Commerce, finance and law

Affinity (law), kinship by marriage
Affinity analysis, a market research and business management technique
Affinity fraud, a type of scam targeting a specific demographic
Affinity marketing, a method of extending market reach by forming partnerships and cross-selling relationships
Affinity Equity Partners, an Asian private equity firm
Affinity Credit Union, a Saskatchewan-based credit union

Affinity (canon law), a kinship arising from the sexual intercourse of a man and a woman
Affinity (Christian organisation), formerly known as the British Evangelical Council
Affinity group, a private, non-commercial and non-governmental organisation formed around a shared interest or goal

Affinity, the UK's first road-legal solar car, built by Cambridge University Eco Racing
Affinity (mathematics), an affine transformation preserving collinearity
Affinity (pharmacology), a characterisation of protein-ligand binding strength
Binding affinity, a measure of the interaction of ligands with their binding sites
Affinity (sociology), a shared interest and commitment between persons in groups and/or willingness to associate
Affinity (taxonomy), a suggestion of common descent or type
Affinity chromatography
Affinity electrophoresis
Affinity laws, laws used in hydraulics to express relationships between variables involved in fan or pump performance
Affine transformation, a type of transformation applied to a geometry
Chemical affinity, used to describe or characterise elements' or compounds' readiness to form bonds
Electron affinity
Processor affinity, a computing term for the assignment of a task to a given core of a multicore CPU
Serif Europe's Affinity series of programs
- Affinity Photo, a raster graphics editor
- Affinity Designer, a vector illustration editor
- Affinity Publisher, a desktop publishing application

Affinity (band), a jazz/rock band active in the late 60s and early 70s
- Affinity (Affinity album), their eponymous début album
Affinity (Bill Evans album), an album by jazz pianist Bill Evans
Affinity (Haken album), an album by the progressive metal band Haken
Affinity (Oscar Peterson album), an album by jazz pianist Oscar Peterson
Johnny Alegre Affinity, a jazz collective based in Manila
Affinity (EP), a 2013 EP by English band Press to Meco

Affinity (novel), a 1999 novel by Sarah Waters
Affinity (film), a 2008 feature film based on this novel
"Affinity" (Stargate SG-1), an episode from season 8 of the TV sci-fi spin-off series Stargate SG-1
Elective Affinities, a novel by Goethe

Affinity (medieval), late medieval retainers of a monarch in "bastard feudalism"
Affinity, West Virginia