Background: Youth development is a target of any country whether the developed or the developing ones for their own self and country welfare. It is urgent when joined with environmental sustainability that youth must have a vital role in activating it represented into pro-environmental behavior. Aim: The study aimed to assess positive youth development towards contribution and pro-environmental behavior among university students for energizing environmental sustainability. Subjects & Methods: A survey was conducted among university students, and the correlational descriptive design was followed to achieve aim and objectives of the study which was conducted on 698 students at ten faculties of Suez Canal University. Three valid and reliable international scales were used for data collection: Positive Youth Development Sustainability Scale; Three-Dimensional Contribution Scale; Pro-Environmental Behavior Scale. Results: The positive youth development scores showed confidence ranking highest, followed by connection, caring, competence, character, and contribution. In addition, contribution scores were highest in the community domain, followed by family and self. Moreover, pro-environmental behavior was strongest in transportation, followed by food, conservation, and environmental citizenship. Conclusion: The positive youth development and pro-environmental behavior have high levels compared to contribution which has too low level to support the relationships with other variables. Hence, there is a weak correlation between contribution and other variables. However, there is no correlation between positive youth development and pro-environmental behavior. Sex, residence and faculty haven't cause variation in all studied variables. Recommendations: Embedding PYD principles directly into university curricula while creating practical environmental engagement opportunities across campus.