This is a special chapter of the Asia Small and Medium-Sized Enterprise Monitor (ASM) focusing on the impact of the coronavirus disease (COVID-19) on micro, small, and medium-sized enterprises (MSMEs) in developing Asia. The study is based on findings from rapid MSME surveys conducted from March to May 2020 in Indonesia, the Lao People's Democratic Republic, the Philippines, and Thailand. The ASM is a knowledge-sharing product series developed as a key resource for MSME development policies in Asia and the Pacific.