The present study shows a piece of research conducted to establish the degree of correlation between anxiety and English proficiency level of adolescents with writing performance in second language (L2) learning. For this purpose, we have developed a predictive-correlational study taking under consideration students from ahigh schoolofGranada(Spain). In our present study, we find that the English proficiency level predictor variable is more closely correlated with writing performance than anxiety. Although the anxiety variable has shown a negative correlation to writing performance, only the former English Proficiency Level has been included in the linear multiple regression model as the single and efficient predictor.