This book consitutes the proceedings of the Third Annual European Symposium on Algorithms, ESA '95, held in Corfu, Greece in September 1995. The volume presents 42 full revised papers selected during a careful refereeing process from a total of 119 submissions; in addition, there is a prominent keynote address. This year, the scope has been further expanded to new areas of computational endeavour in science; the book covers many aspects of algorithms research and application ranging from combinatorial mathematics to hardware design.