In game theory, a Nash equilibrium is an array of strategies, one for each player, such that no player can obtain a higher payoff by switching to a different strategy while the strategies of all other players are held fixed. The concept is named after John Forbes Nash Jr.

Równowaga Nasha to jedno z ważniejszych pojęć z teorii gier. Wprowadził je noblista John Nash (na zdjęciu), o którego życiu opowiada fabularyzowany film "Piękny umysł"