The authors carried out an assessment of social support networks with a sample of 884 Spanish adolescents aged 12 to 17. The main goal was to analyze the development of the figures of parents and peers as providers of social support in the two basic dimensions of emotional and instrumental support. In peers, they distinguished between the contexts from which they came (school, associations, and friends from the community) to observe whether there were different tendencies. The results of the MANOVA indicate significant effects on both dimensions for the factors age, provider, and interaction between the two. The authors conclude that the tendencies for decline in the provision of support from parents and the corresponding increase in support from peers during adolescence are different for each dimension, and also for the different types of friends, according to context. Parents maintain a good level of instrumental support, but not of emotional support. (Contains 3 tables and 2 figures.)