La nostalgia (del griego clásico νόστος «regreso» y ἄλγος «dolor») es descrita como un sentimiento de anhelo por un momento, situación o acontecimiento pasado. La nostalgia es referida comúnmente como un sentimiento que cualquier persona puede atravesar en cualquier etapa biológica. Es el sufrimiento de pensar en algo que se ha tenido o vivido en una etapa y ahora no se tiene, está extinto o ha cambiado. La nostalgia se puede asociar a menudo con una memoria cariñosa de la niñez, un ser querido, un lugar, un juego o un objeto personal estimado, o un suceso en la vida del individuo o grupo.

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Nostalgia is a sentimentality for the past, typically for a period or place with happy personal associations. The word nostalgia is learned formation of a Greek compound, consisting of νόστος (nóstos), meaning "homecoming", a Homeric word, and ἄλγος (álgos), meaning "pain, ache", and was coined by a 17th-century medical student to describe the anxieties displayed by Swiss mercenaries fighting away from home. Described as a medical condition—a form of melancholy—in the Early Modern period, it became an important trope in Romanticism. Nostalgia can refer to a general interest in the past, its personalities, and events, especially the "good old days" from earlier in one's life. The scientific literature on nostalgia usually refers to nostalgia regarding the personal life and has mainly studied the effects of nostalgia induced during the studies. Smell and touch are strong evokers of nostalgia due to the processing of these stimuli first passing through the amygdala, the emotional seat of the brain. These recollections of one's past are usually important events, people one cares about, and places where one has spent time. Music and weather can also be strong triggers of nostalgia. Nostalgic preferences, the belief that the past was better than is the present, has been linked to biases in memory.

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