The 2015 Workshop on Visual Analytics in Healthcare (VAHC 2015) is the sixth annual workshop that provides an opportunity for participants to discuss state-of-the-art data visualization techniques and review how such techniques can be applied to healthcare data. The primary objective of the annual workshop is to bring together medical experts, leading scientists, and visionaries to discuss visualization techniques that can be applied to healthcare data and discuss the areas of healthcare that need more attention from the visualization and visual data mining communities. The workshop will allow participants to showcase their ongoing work on visual analytics of healthcare-related data through podium, posters, or demo presentations as well as to learn more about emerging techniques, software applications, and datasets. This year the VAHC 2015 workshop is co-located with the IEEE VIS conference in Chicago, Illinois. To formalize the community, the VAHC workshop and the workshop on Visualizing Electronic Health Record Data -- EHRVis (www.cs.umd.edu/hcil/parisehrvis/) have merged and plan on hosting events at IEEE VIS and the American Medical Informatics Association (AMIA) Annual Symposium, alternating yearly.