In this chapter, several kinds of MI-based applications are introduced. Specifically, the MI-based localization system is one of the most widely used and mature applications of the MI-based techniques. Thus, this chapter first describes several typical MI localization applications, such as the motion capture system, pipeline position systems, and fusion localization with other techniques (such as inertial measurement correction). Second, we summarize some MI-based communication applications for IoT, such as radio frequency identification, through-the-earth communication and underwater communication.