This Geotechnical Special Publication, Deep Foundations and Geotechnical In Situ Testing (GSP 205), contains 49 papers examining the areas of deep foundations and in situ geotechnical testing and monitoring techniques. This proceedings offers the latest and most current thinking on topics such as piled raft system and soil-structure interaction; deep foundations; innovative foundations; and in situ testing. These papers were presented at the GeoShanghai 2010 Conference, sponsored by the Geo-Institute of the American Society of Civil Engineers, held in Shanghai, China, June 35, 2010.