This book constitutes the refereed proceedings of the Third International Conference on Love and Sex with Robots, LSR 2017, held in December 2017, in London, UK. The 12 revised papers presented together with 2 keynotes were carefully reviewed and selected from a total of 83 submissions. One of the biggest challenges of the Love and Sex with Robots conference is to engage a wider scientific community in the discussions of the multifaceted topic, which has only recently established itself as an academic research topic within, but not limited to, the disciplines of artificial intelligence, human-computer interaction, robotics, biomedical science and robot ethics etc. .