This volume contains the papers presented at the 23rd Canadian Conference on Arti?cial Intelligence (AI 2010). The conference was held in Ottawa, Ontario, fromMay31toJune2,2010,andwascollocatedwiththe36thGraphicsInterface Conference(GI2010),andthe7thCanadianConferenceonComputerandRobot Vision (CRV 2010). The Program Committee received 90 submissions for the main conference, AI2010,fromacrossCanadaandaroundtheworld.Eachsubmissionwasreviewed byuptofourreviewers.Forthe?nalconferenceprogramandforinclusioninthese proceedings, 22 regular papers, with allocation of 12 pages each, were selected. Additionally,26 shortpapers,with allocationof 4 pageseach,wereaccepted. The papers from the Graduate Student Symposium are also included in the proceedings:sixoral(fourpages)andsixposter(twopages)presentationpapers. The conference programfeatured three keynote presentations by Dekang Lin (Google Inc.), Guy Lapalme (Universit'edeMontr' eal), and Evangelos Milios (Dalhousie University). The one-page abstracts of their talks are also included in the proceedings. Two pre-conference workshops, each with their own proceedings, were held on May 30, 2010. The Workshop on Intelligent Methods for Protecting Privacy and Con?dentiality in Data was organized by Khaled El Emam and Marina Sokolova. The workshop on Teaching AI in Computing and Information Te- nology (AI-CIT 2010) was organized by Danny Silver, Leila Kosseim, and Sajid Hussain. This conference wouldnot havebeen possible without the hardworkofmany people.WewouldliketothankallProgramCommitteemembersandexternal- viewers for their e?ort in providing high-quality reviews in a timely manner. We thank all the authors of submitted papers for submitting their work,and the - thors of selected papers for their collaboration in preparation of the ?nal copy. ManythankstoEbrahimBagheriandMarinaSokolovafororganizingtheGra- ateStudentSymposium,andchairingtheProgramCommitteeofthesymposium. We are in debt to Andrei Voronkov for developing the EasyChair conference managementsystemandmakingitfreelyavailabletotheacademicworld.Itisan amazinglyelegantand functionalWeb-basedsystem,whichsavedus muchtime.