[en] Objective:to analyze the effects of a Mindfulness-based intervention on nurse leaders' emotional intelligence and resilience. Method:a pilot study of a randomized crossover clinical trial. The sample (n=32) was randomized into Group A (n=18) and Group B (n=14) and evaluated at the pre-test, post-test and follow-up moments. The outcomes were assessed using the Emotional Intelligence Measure, the Connor-Davidson Resilience Questionnaire and the Five Facet Mindfulness Questionnaire, and analyzed using Generalized Linear Mixed Models. Results:a total of 32 nurses with a mean age of 42.6 years old were evaluated. The analyses showed significant interactions between the effects of the group x moment factors on the Self-motivation (p=0.005), Sociability (p<0.001), Self-control (p=0.013), and Total (p=0.002) emotional intelligence skill scores; as well as on the Observe (p=0.042), Describe (p=0.008), Non-judgment (p<0.001), Act with awareness (p=0.004) and Total (p<0.001) mindfulness facets. Post-test: there was a statistically significant increase in the Sociability (p=0.009) and Self-control (p=0.015) emotional intelligence skills; as well as in the Non-judgment (p=0.022) and Total (p=0.002) mindfulness facets. Follow-up: a significant increase was observed in the Non-judgment (p=0.024) and Total (p=0.026) mindfulness facets. The "resilience" variable did not present statistical significance in the "group x moment" factor, both in the post-test and during follow-up. Conclusion:the Mindfulness-based intervention used proved to be effective in increasing nurse leaders' emotional intelligence and dispositional mindfulness skills. Brazilian Registry of Clinical Trials (RBR-3c62gy), registered on March 4 th , 2020, updated on September 16 th , 2022. Background:(1) Unpublished study of a Mindfulness-based intervention with nurse leaders. Background:(2) Positive effect on the participants' emotional intelligence and mindfulness. Background:(3) Advances in knowledge about emotional intelligence and leadership resilience. Background:(4) It encourages the implementation of sensitive and innovative health strategies.

[pt] Objetivo::analisar os efeitos de uma intervenção baseada emmindfulnessna inteligência emocional e resiliência de enfermeiros líderes. Método::estudo-piloto de ensaio clínico randomizado cruzado. Amostra (n=32) randomizada em grupo A (n=18) e grupo B (n=14), avaliados nos momentos pré-teste, pós-teste e seguimento. Os desfechos foram avaliados pela Medida de Inteligência Emocional, pelo Questionário de Resiliência Connor-Davidson e pelo Questionário das Cinco Facetas deMindfulness, e analisados peloGeneralized Linear Mixed Model. Resultados::foram avaliadas 32 enfermeiras com idade média de 42,6 anos. As análises mostraram interações significativas dos efeitos dos fatores Grupo x Momento nos escores das habilidades de automotivação (p=0,005), sociabilidade (p<0,001), autocontrole (p=0,013) e total (p=0,002) de inteligência emocional; das facetas observar (p=0,042), descrever (p=0,008), não julgar (p<0,001), agir com consciência (p=0,004) e total (p<0,001) demindfulness. Pós-teste: houve aumento estatisticamente significante das habilidades de sociabilidade (p=0,009) e autocontrole (p=0,015) de inteligência emocional; das facetas não julgar (p=0,022) e total (p=0,002) demindfulness. Seguimento: observou-se aumento significativo das facetas não julgar (p=0,024) e total (p=0,026) demindfulness. A variável resiliência não apresentou significância estatística no fator Grupo x Momento, no pós-teste e seguimento. Conclusão::a intervenção baseada emmindfulnessutilizada mostrou-se efetiva no aumento das habilidades de inteligência emocional emindfulnessdisposicional de enfermeiros líderes.Registro Brasileiro de Ensaios Clínicos(RBR-3c62gy), registrado em 04 de março de 2020, atualizado em 16 de setembro de 2022.