Resumen: This study aims to analyse the relationship between eudaimonic well-being, emotional intelligence and affects in early adolescents. Eudaimonic well-being is based on the development of personal skills, based on the premise that people are happy if they have a life purpose, challenges and growth. Emotional intelligence and affects can play a key role in this. The sample analysed comprised 344 first- and second-year secondary school students, aged 12 to 15 years (49.13% boys; M age = 12.86 years), and the relationship between the three target constructs – eudaimonic well-being, affects and emotional intelligence – was analysed. The survey was designed as a lateral study based on natural groups. The instruments used were the Eudaimonic well-being questionnaire, the Emotional intelligence questionnaire and the Positive and negative affect scale for children and adolescents. The results show that these constructs are related to one another. One in three participants yielded low scores in terms of eudaimonic well-being, emotional intelligence and positive affects. One in three yielded high values. The study also analysed the mediating role that emotional intelligence plays in well-being, which is increased when affects play a mediating role. According to our research, the emotional intelligence has a direct positive effect on well-being of 0.31 (p < 0.001), with a total effect (direct + indirect effects) mediated by positive and negative affects of 0.48 (p < 0.001), which suggests that positive and negative affects directly mediate the relationship between EI and eudaimonic well-being. Regression analysis revealed that three of the components of emotional intelligence (emotional self-awareness, emotional regulation and the use of emotions in problem-solving) and positive and negative affects can be used to predict eudaimonic well-being, with an aggregate variance of 70.2%. It is concluded that emotional intelligence and affects play a role in eudaimonic well-being in early adolescents. Therefore, early emotional and affective training can lead to an increase in eudaimonic well-being, which opens interesting avenues for future research. Idioma: Inglés DOI: 10.1007/s12144-020-01208-y Año: 2022 Publicado en: Current Psychology 41 (2022), 6945–6953 ISSN: 1046-1310 Factor impacto JCR: 2.8 (2022) Categ. JCR: PSYCHOLOGY, MULTIDISCIPLINARY rank: 56 / 147 = 0.381 (2022) - Q2 - T2 Factor impacto CITESCORE: 4.6 - Psychology (Q2)