Background: There are limited studies on the prevalence of adherence to the combined guidelines for physical activity (PA), sedentary behavior, and sleep in children and adolescents. Moreover, little is known about correlates of adherence to the guidelines. Therefore, the main aim of this study is to examine the prevalence and identify the correlates of adherence to the combined movement guidelines among children and adolescents. Methods: A total of 355 children and 324 adolescents from the Czech Republic participated in this study. PA and sleep duration were estimated using multi-day 24-hour raw data from wrist-worn accelerometers. Recreational screen time was self-reported. Sixteen potential correlates were grouped into three homogenous categories for biological and cognitive, behavioral, and family correlates. The multi-level multivariable regression was applied to identify correlates of adherence to combined movement guidelines and to specific combinations of any of two recommendations.Results: Approximately 6.5% of children and 2.2% of adolescents met all recommendations of the combined movement guidelines. Paternal overweight and obesity was significantly associated with adherence to the combined movement guidelines in children (OR = 0.3; 95% CI = 0.1–0.7). Additionally, children had higher odds of meeting specific combinations of two recommendations if they reported healthy diet, participated in organized PA, or if their fathers had a university degree. Meanwhile, paternal overweight and obesity, and high sleep efficiency were associated with lower odds of meeting specific combinations of recommendations. In adolescents, healthy diet, organized PA, and active play were associated with higher odds of meeting specific combinations of any two recommendations. Conclusions: A low proportion of children and adolescents met the combined movement guidelines and several correlates related to family were identified. Family is a key source of influence for healthy movement behaviors during childhood and adolescence.