This volume contains a selection of the papers presented at the XIV Jornadas sobre Programación y Lenguajes (PROLE 2014), held at Cádiz, Spain, during September 17th-19th, 2014. Previous editions of the workshop were held in Madrid (2013), Almería (2012), A Coruña (2011), Valéncia (2010), San Sebastián (2009), Gijón (2008), Zaragoza (2007), Sitges (2006), Granada (2005), Málaga (2004), Alicante (2003), El Escorial (2002), and Almagro (2001). Programming languages provide a conceptual framework which is necessary for the development, analysis, optimization and understanding of programs and programming tasks. The aim of the PROLE series of conferences (PROLE stems from the spanish PROgramación y LEnguajes) is to serve as a meeting point for spanish research groups which develop their work in the area of programming and programming languages. The organization of this series of events aims at fostering the exchange of ideas, experiences and results among these groups. Promoting further collaboration is also one of the main goals of PROLE.