This volume constitutes the refereed proceedings of the 18thInternational Symposium on Graph Drawing, GD 2010, held in Konstanz, Germany, during September 2010.The 30 revised full papers presented together with 5 revised short and 8poster papers were carefully reviewed and selected from 77 submissions.The volume also contains a detailed report about the 17th Annual GraphDrawing Contest, held as a satellite event of GD 2010. Devoted both totheoretical advances as well as to implemented solutions, the papers areconcerned with the geometric representation of graphs and networks andare motivated...