The 2001 Workshop on Algorithms and Data Structures (WADS 2001) was held on August 8-10, 2001 at Brown University. WADS 2001 was sponsored by the Center for Geometric Computing and by the Department of Computer Science at Brown University, with additional support from John Wiley & Sons, Inc. Participants from all over the world attended the workshop, which is a forum for researchers in the area of design, analysis, and implementation of algorithms and data structures. Plenary lectures were given by Mike Atallah (Purdue) on `Secure Multi-Party Computational Geometry,' Tom Leighton (Akamai) on `The Challenges of Delivering Content on the Internet ...