An active lifestyle, based on regular practice of physical activity and reduced time of screen use, may be important to mental health (e.g., satisfaction of body image) among young people. This study aimed to analyze the association between screen use time, physical activity (PA) level, and self-perception of body image. This was a cross-sectional study with adolescents aged 11 to 18 from schools from Fortaleza, Ceará, in 2014. Sample included 1,182 subjects, predominantly male (51.5%). Screen time (2 hours/day) and PA level (420 minutes/week) were investigated through standardized questionnaire. Perception of the body image was assessed using the Stunkard et al.’s 9-points silhouettes scale, considering the difference between the perception of current body image and desirable body image.