Coronavirus disease-19 (COVID-19) infection may be accompanied by various neurological complications. Among them, demyelinating disease involving the central nervous system has rarely been reported in association with COVID-19 infection. Herein, we report a case of newly diagnosed neuromyelitis optica spectrum disorder (NMOSD) right after COVID-19 infection. From our case, autoimmunity induced by para- and post-infectious immunologic responses or direct viral invasion might contribute to the development of NMOSD.