Abstract Objectives This study examined the impact of the Mindfulness-Based Kindness Curriculum (MBKC) on social-emotional, executive function, and academic skills of preschoolers. Method Sixteen preschool and 4K (4-year-old kindergarten) classrooms (245 children, 57.6% ethnically diverse, 69.8% low SES) were randomly assigned to either a curriculum-as-usual (CAU) or MBKC group taught by...