This volume constitutes the refereed proceedings of the 7th Scandinavian Workshop on Algorithm Theory, SWAT 2000, held in Bergen, Norway, in July 2000. The 43 revised full papers presented together with 3 invited contributions were reviewed and selected from a total of 105 submissions. The papers are organized into sections on: data structures; dynamic partitions; graph algorithms; online algorithms; approximation algorithms; matchings; network design; computational geometry; strings and algorithm engineering; external memory algorithms; optimization; and distributed and fault-tolerant...