IntroductionThe present study examined the between‐ and within‐person associations among negative weight‐related experiences, weight bias internalization, and body shame, embarrassment, and pride in adolescents.MethodsParticipants were 93 Canadian students (Mage = 15.54, 59.10% girls, 40.86% white) who completed a 5‐day daily diary study in 2021. Multilevel models were estimated to examine the between‐ and within‐person associations, as well as the cross‐level interactions.ResultsFifty‐nine negative weight‐related experiences were reported from 22 participants (23.66%) over the 5‐day study period. Adolescents with higher average negative weight‐related experiences (OR = 19.60, 95% CI = 1.90–202.67) and weight bias internalization (OR = 3.66, CI = 2.07–6.46) had greater odds of reporting shame. Similarly, higher average negative weight‐related experiences (OR = 16.29, CI = 3.65–72.75) and weight bias internalization (OR = 2.08, CI = 1.53–2.82) was associated with greater odds of embarrassment. No within‐person effects were noted, such that reporting more negative weight‐related experiences or weight bias internalization than one's own average was not related to body emotions.ConclusionsThis distinction underscores that the persistent, rather than episodic, aspects of negative weight‐related experiences and weight bias internalization are most impactful on adolescents’ body image. These findings have implications for recruitment and screening for individual‐level interventions for internalized weight bias and body image, and highlight the need for system‐level policies and changes that prohibit negative weight‐related experiences and messages to reduce likelihood of internalizing weight bias among adolescents.