This book constitutes the thoroughly refereed revised selected papers of the 16th International Symposium on Trends in Functional Programming, TFP 2015, held in Sophia Antipolis, France, in June 2015. The 8 revised full papers included in this volume were carefully and selected from 26 submissions. TFP is an international forum for researchers with interests in all aspects of functional programming, taking a broad view of current and future trends in the area. It aspires to be a lively environment for presenting the latest research results, and other contributions, described in draft papers submitted prior to the symposium.