The FOOL/WOOD workshop series is traditionally co-located with POPL, but this year we are trying something new, co-locating with OOPSLA and SPLASH! FOOL'10 will be held in October, in Reno, Nevada. Specific topics addressed in past workshops have included semantics, object calculi, type theory, and program verification of object-oriented languages. More recently special efforts have been made to include contributions on foundational issues related to concurrent and distributed object-oriented languages, and database languages with object-oriented features.