RESUMEN
The dataset presented in this article examines preventive behaviors related to Covid-19 among Indonesians, i.e., wearing a mask, hand washing, and distancing, and its related determinants. Data collection was carried out when Indonesia was facing the second waves due to the rapid transmission of the Delta variant virus. The data assessing socio-demographic information, beliefs related to Covid-19 preventive behaviors based on the reasoned action approach, general beliefs about Covid-19, and Covid-19 preventive behaviors, from 18th June to 18th August 2021, gathering a total of 863 completed responses. The sampling technique in this online survey used a combination of purposive and snowball sampling methods to gather the participants via social media such as Instagram, Twitter, Facebook, and WhatsApp throughout Indonesia. The survey data were analyzed using frequency distributions and bivariate correlation analysis. The data will help to understand the psychosocial determinants of Covid-19 preventive behaviors and provide insight for the development of behavior change intervention to limit the spread of Covid-19 among Indonesians.