The WHO Guidance for Conducting a Country COVID-19 Intra-Action Review (IAR) was developed to guide countries to conduct periodic review(s) of their national and subnational COVID-19 response, so countries do not miss critical opportunities for learning and improvement to better respond to the COVID-19 outbreak in their countries, especially as the possibility of a protracted pandemic becomes increasingly probable. The IAR is a country-led facilitated process conducted during the COVID-19 outbreak in-country, bringing together a small group of COVID-19 responders with knowledge of the public health response pillars under review. Although IARs can be conducted online or face-to-face, the online format is recommended, especially if community transmission remains high in the country. The IAR will identify practical areas for immediate remediation and sustained improvement of the ongoing response.