<div>This book constitutes the refereed proceedings of the 14th International Conference&nbsp;on&nbsp;Decision and Game Theory for Security, GameSec 2023, held in Avignon, France,&nbsp;during&nbsp;October 18-20, 2023.</div><div><br></div><div>The&nbsp;19&nbsp;full papers and 4 short papers included in this book were carefully reviewed and&nbsp;selected from&nbsp;33&nbsp;submissions. They were organized in topical sections as follows:&nbsp;Mechanism design and imperfect information,&nbsp;Security Games,&nbsp;Learning in security games,&nbsp;Cyber deception,&nbsp;Economics of security,&nbsp;Information and privacy and&nbsp;Short articles.</div>