This bookconstitutes the proceedings of the 12th International Conference on DistributedComputing and Internet Technology, ICDCIT 2016, held in Bhubaneswar, India, inJanuary 2016. The 6 fullpapers, 7 short papers and 11 poster papers presented in this volume werecarefully reviewed and selected from 129 submissions. The ICDCIT conferencefocusses on distributed computing, internet technologies, and societalapplications. The book also contains 3 full paper invited talks.