The COVID-19 pandemic has already hit almost all countries in the world. Diseases that are transmitted very quickly and often show no symptoms make some people feel scared and anxious. Nursing mothers are one of the vulnerable groups and a pandemic can cause confusion when it comes to breastfeeding infants. The anxiety that occurs in nursing mothers will interfere with the process of breastfeeding. The purpose of this study is to find out the relationship of anxiety to breastfeeding behavior in nursing mothers during the COVID-19 pandemic.