Soccer is a sports type that is done for long time duration. Therefore, it is important for soccer athletes to maintain the adequacy of body fluids so that sports performance is maintained properly. The purpose of the study is to determine the level of knowledge and hydration awareness on adolescents football athletes. The method used in this research is quantitative descriptive. A hydration knowledge and awareness questionnaire are used as a research instrument. The sample of research is 18 boys selected by purposive sampling technique. Data were analyzed using mean, standard deviation and percentage. The result data showed that the average of hydration knowledge level of 59,72 included in good category and hydration awareness level equal to 55,6 including in very good category. The fact above is a positive thing because with a high level of hydration awareness then athletes can reduce the risk of dehydration and decreased performance during exercise.