The search for sound principles for object-oriented languages has given rise to much work during the past two decades, leading to a better understanding of the key concepts of object-oriented languages and to important developments in type theory, semantics, program verification, and program development. FOOL 2014 will be held in October 2014 as part of SPLASH 2014. The conference venue is the Marriot Hotel in Portland, Oregon, United States. Submissions for this event are invited in the general area of foundations of object-oriented languages. Topics of interest include language semantics, type systems, memory models, program verification, formal calculi, concurrent and distributed languages, database languages, and language-based security issues. Papers are welcome to include formal descriptions and proofs, but these are not required; the key consideration is that papers should present novel and valuable ideas or experiences. The main focus in selecting workshop contributions will be the intrinsic interest and timeliness of the work, so authors are encouraged to submit polished descriptions of work in progress as well as papers describing completed projects.