JPI may refer to: Pope John Paul I (1912–1978) Java Platform Interface Jeju Peace Institute, a South Korean think tank Jinnah Polytechnic Institute, in Faisalabad, Punjab, Pakistan Joint Programming Initiative by the European Commission Journal of Political Ideologies J.P. Instruments, American avionics manufacturer Juvenile Psychopathic Institute, now the Institute for Juvenile Research at the University of Illinois at Chicago