Research on positive youth development and life skills in sport has gained considerable attention over the past decades. However, there is a lack of translated questionnaires examining youth development and life skills available to non-English researchers and practitioners. The purpose of this research project was to adapt in French two questionnaires and to accumulate validity evidence of these adaptations. The short form--Youth Experiences Survey for Sport and the Life Skills Scale for Sport were adapted using a procedure based on a transcultural validation methodology applied to psychological measures. This research comprises four studies, which led to the French adaptation and validation process of each questionnaire. In conclusion, the results obtained show that these adapted French questionnaires can now be used to evaluate the perceptions and lived experiences of French-speaking athletes regarding positive youth development and life skills in sport.