This document summarizes the LD4KD 2015 workshop, which brought together researchers from the linked data and knowledge discovery communities. The workshop included two paper presentations, a demo session, and discussions on opportunities and challenges at the intersection of linked data and knowledge discovery. Some opportunities discussed were using linked data as input for knowledge discovery due to its large, global scale and ability to be extended and enriched. Challenges discussed included dealing with linked data as a graph structure, its distributed and incomplete nature, and ensuring its quality and reducing bias. The goal of the workshop was to further understanding and develop practical tools to address these challenges.