The ?rst Algorithmic Number Theory Symposium took place in May 1994 at Cornell University. The preface to its proceedings has the organizers expressing the hope that the meeting would be "the ?rst in a long series of international conferencesonthe algorithmic, computational, andcomplexity theoreticaspects of number theory." ANTS VIII was held May 17-22, 2008 at the Ban? Centre in Ban?, Alberta, Canada. It was the eighth in this lengthening series. The conference included four invited talks, by Johannes Buchmann (TU Darmstadt), AndrewGranville(UniversitedeMontr eal), Fran, coisMorain(Ecole Polytechnique), andHughWilliams(UniversityofCalgary), apostersession, and 28 contributed talks in appropriate areas of number theory. Each submitted paper was reviewed by at least two experts external to the Program Committee; the selection was made by the committee on the basis of thoserecommendations.TheSelfridgePrizeincomputationalnumbertheorywas awardedtotheauthorsofthebestcontributedpaperpresentedattheconference. The participants in the conference gratefully acknowledge the contribution made by the sponsors of the meeting. May 2008 Alf van der Poorten and Andreas Stein (Editors) Renate Scheidler (Organizing Committee Chair) Igor Shparlinski (Program Committee Chair) Conference Website The names of the winners of the Selfridge Prize, material supplementing the contributed papers, and errata for the proceedings, as well as the abstracts of the posters and the posters presented at ANTS VIII, can be found at: http: //ants.math.ucalgary.ca."