Mobile phones are becoming the next computing platform that is already dominating as our main source for communication and basic computing needs. In addition, the mobile phones are becoming more and more popular for healthcare monitoring. Subsequently, we expect better functionality, performance as well as a longer battery life from our mobile and hand-held devices. Better functionality and performance usually come at the expense of battery life. The battery life is critical to providing all of the functionality the user is expecting. To investigate the impact of such issues, the Workshop on Energy Efficient Mobile Computing is being organized to bring together researchers and practitioners to explore the challenges, opportunities, and approaches of energy-aware hardware, operating system, and software design for mobile devices. This workshop focuses on all aspects of application, OS, and hardware design that provide novel functionality without compromising energy efficiency.