This volume constitutes the refereed proceedings of the Second International Conference on Intelligent Information Technologies, ICIIT 2017, held in Chennai, India, in December 2017. The 20 full papers and 7 short papers presented were carefully reviewed and selected from 117 submissions. They feature research on the Internet of Things (IoT) and are organized in the following topical sections: IoT enabling technologies; IoT security; social IoT; web of things; and IoT services and applications.