The 2015 International Workshop on Performance Evaluation of Tracking and Surveillance (PETS’15) continues the series of highly successful PETS workshops held for over ten years (FG 00, CVPR ’01, ECCV ’02, ICVS ’03, ICCV ’03, ECCV’04,…, AVSS’12, WVM’13, AVSS’14). The goal of the PETS workshop has been to foster the emergence of methodology for performance evaluation of tracking and surveillance. This includes development of performance evaluation metrics as well as a quantitative evaluation of tracking and surveillance results based on a common dataset. PETS 2015 addresses the application of multi sensor surveillance for protection of critical infrastructure. Such infrastructure (including power plants and mobile assets) could be considered as targets for activists or even terrorists.