The 34th IEEE International Conference on Micro Electro Mechanical Systems (IEEE MEMS 2021) is one of the premier annual events reporting research results on all scientific aspects of Micro/Nanoscale Devices, Micro/Nanosystems, as well as their relevant technologies and industrial trends. This conference captures the rapid proliferation from the commitment and success of the multidisciplinary microsystems and nanotechnology research communities. In recent years, the annual IEEE MEMS Conference has attracted more than 700 participants, 800+ abstract submissions and has established the forum for presenting over 200 select papers in lecture and poster sessions. Its highly integrated format provides ample opportunities for interactions among attendees, presenters and exhibitors. While the current COVID-19 pandemic and global travel restrictions impose unprecedented challenges on having the conference in traditional fashion, the IEEE MEMS 2021 will be the first-ever online/virtual conference in this series, and will be the international forum where our multidisciplinary communities showcase our resilience and sustained endeavors, in advancing the field and venturing into new frontiers.