The 12th ACM International Symposium on Mobility Management and Wireless Access (MobiWac 2014) will be held in conjunction with MSWiM 2014 (the 17th ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems) from September 21 to 26, 2014 at Montreal, Canada. The MOBIWAC series of events are intended to provide an international forum for the discussion and presentation of original ideas, recent results and achievements by researchers, students, and systems developers on issues and challenges related to mobility management and wireless access protocols. To keep up with the technological developments, we also open up new areas such as mobile cloud computing starting from this year. Authors are encouraged to submit both theoretical and practical results of significance on all aspects of wireless and mobile access technologies, with an emphasis on mobility management and wireless access. Authors are invited to submit full papers describing original research. Submitted papers must neither have been published elsewhere nor currently be under review by another conference or journal.