This is Number 33 of the Marine Corrosion of Stainless Steels, a publication of the European Federation of Corrosion (EFC). Part I of this volume on the "Marine Corrosion of Stainless Steels" consists of five chapters and is concerned with tests that were conducted in the 1990s on the corrosivity of European sea waters (Atlantic, Baltic, English Channel, Mediterranean, and North Sea) towards three types of stainless steels. Results from these two test programmes were presented at a European Workshop on Sea Water Corrosion of Stainless Steels in Trondheim in 1996 and at various corrosion conferences, mostly in Europe. The other four chapters in Part I describe experimental procedures, critical pitting temperature data, crevice corrosion results and results from the MAST biofilm studies. The remaining 23 chapters of the book are concerned with reviews and reports that develop the above topics.