a principle in alchemy of opposing or complementary elements or spirits

Dualism, a twofold division in several spiritual, religious, and philosophical doctrines

"Duality", a fictional arcade game that exists as a mini-game in the videogame Grand Theft Auto: San Andreas

an archetype in analytical psychology relating to the functioning of the psyche

Dualism (philosophy of mind), where the body and mind are considered to be irreducibly distinct

Wave-particle duality, a concept in quantum mechanics

Duality, a computer program for changing themes in Mac OS X

the relationship in knowledge management between explicit knowledge (hard) and tacit knowledge (soft)

Nonduality summary and related information.

Yin Yang

De Morgan's Laws, specifically the ability to generate the dual of any logical expression.

a Community of practice, where a duality is a central driving process

Duality, a Star Wars fan film by Dave Macomber and Mark Thomas

Duality, a 2004 single & Grammy-nominated song by metal band Slipknot

Duality (mathematics), a mathematical concept

Duality, a 2007 single from alternative rock/punk rock band Bayside

Duality, a full-length feature film created by Door Eleven Productions from Boston, MA

Duality, an album by Lisa Gerrard and Pieter Bourke

Duality, a 2005 album by the rock band Ra

Duality (electrical engineering), regarding equation equivalence

"Duality", one of two distinct unreleased games made by Double Aught Software or Phantagram