Research on visual tracking remains limited due to the lack of standardised evaluation protocols and online reference repositories showing results on community accepted reference videos. VOT2013 invites researchers to participate in a first challenge focusing on single object visual tracking. The aim of the accompanying VOT2013 workshop, which will be held in conjunction with ICCV2013, is to provide a common platform for comparison, analysis and discussion of existing as well as new single object trackers. We provide an evaluation kit that includes videos with annotated ground truth as well as evaluation software to automate the experiments and calculate the performance measures.