The International Workshop on Integrated Nonlinear Microwave and Millimetre-wave Circuits (INMMiC) is a forum for promoting, discussing and spreading ideas in the field of nonlinear microwave and millimetre-wave circuits and systems. INMMiC was originally launched in Duisburg, Germany, in 1990, and it achieved the present form in Rome, Italy, in 2004. Subsequently INMMiC has been held at different venues around Europe: 2012 (Ireland), 2014 (Belgium), 2015 (Italy), and 2017 (Austria). INMMiC 2018 will feature a two-day archival series of oral and poster presentations with distinguished invited talks. An industrial exhibit featuring a selection of state-of-the-art microwave products, measurement instruments and CAD software will also be held. The participation of young researchers and postgraduate students is strongly encouraged. A Best Student Paper Award will be supported by the GAAS Association.