This book consitutes the refereed proceedings of the 15th International Conference on Distributed Computing, DISC 2001, held in Lisbon, Portugal, in October 2001.The 23 revised papers presented were carefully reviewed and selected from 70 submissions. Among the issues addressed are mutual exclusion, anonymous networks, distributed files systems, information diffusion, computation slicing, commit services, renaming, mobile search, randomized mutual search, message-passing networks, distributed queueing, leader election algorithms, Markov chains, network routing, ad-hoc mobile networks, and adding networks.