This book constitutes the refereed proceedings of the Third International Conference on Future Data and Security Engineering, FDSE 2016, held in Can Tho City, Vietnam, in November 2016. The 28 revised full papers and 7 short papers presented were carefully reviewed and selected from 128 submissions. The accepted papers were grouped into the following sessions:Advances in query processing and optimizationBig data analytics and applicationsBlockchains and emerging authentication techniquesData engineering tools in software developmentData protection, data hiding, and access controlInternet of Things and applicationsSecurity and privacy engineeringSocial network data analytics and recommendation systems