The IEEE Sixth International Conference on Biometrics: Theory, Applications and Systems (BTAS 2013), a continuation of the highly successful BTAS conference series started in 2007, will be held in the September 29 – October 2, 2013 time period in Washington, DC. BTAS 2013 is the premier research conference focused on all aspects of biometrics. It is intended to have a broad scope, including advances in fundamental signal processing, image processing, pattern recognition and statistical and mathematical techniques relevant to biometrics, new algorithms and/or technologies for biometrics, analysis of specific applications, and analysis of the social impact of biometrics technology. Areas of coverage include biometrics based on voice, fingerprint, iris, ocular, face, handwriting, gait and other modalities, as well as multi-modal biometrics and new biometrics based on novel sensing technologies. Submissions will be rigorously reviewed, and should clearly make the case for a documented improvement over the existing state of the art. Experimental results for contributions in established areas such as voice, face, iris, fingerprint, and gait are encouraged to use the largest and most challenging existing publicly available datasets. Papers examining the usability of and social impact of biometrics technology are encouraged.