Interpersonal electronic surveillance involves seeking information about a romantic partner on social media platforms, aiming to gain insights into their offline and/or on-line behaviors. This study aimed to adapt and validate the Interpersonal Electronic Surveillance Scale for Social Media in Brazil (ISS-Brazil). The scale was translated into Brazilian Portuguese and administered to a sample of 373 participants who completed an on-line questionnaire. The empirical structure of the scale was examined, and correlations were computed with relationship satisfaction, adult attachment, cyberstalking, self-esteem, and isolation during the 2020 Covid pandemic, in addition to verifying its internal consistency. The scores on the scale were correlated within groups of participants who lived together with their romantic partners from the peak of the Covid pandemic in 2020 until the present and the degree of social isolation due to the pandemic. The same was done for the group of participants who lived separately. Mean differences in ISS-Brazil scores between romantic partners living together and apart since the 2020 isolation were tested. The results indicated that the model had a good fit and internal consistency. There was no significant correlation between surveillance and social isolation. Significant correlations were found between surveillance and cyberstalking, anxious adult attachment, and self-esteem. Participants living together with romantic partners during the pandemic had lower mean scores on the ISS-Brazil scale than those living separately. The findings suggest that the ISS-Brazil scale is suitable for measuring interpersonal electronic surveillance in the Brazilian context, presenting adequate psychometric properties.