This final paper seeks to analyze and show in more detail the importance of the application of social networks in the banking sector and their special significance during the COVID-19 pandemic. The paper is presented on the example of Zagrebačka banka d.d. The theoretical part of the paper lists the types of social networks and their advantages and disadvantages, what makes up the marketing mix and what marketing strategies can be implemented. On the analyzed example of Zagrebačka banka d.d. a brief history of business, plans and uses of various social networks as well as their advantages and disadvantages for doing business in the banking economy is presented. Zagrebačka banka d.d. recognized the importance of communication through social networks and especially emphasized the importance, manner and communication of Zagrebačka banka d.d. with escorts and employees during the COVID- 19 pandemic. It can be seen from the example that Zagrebačka banka d.d. the social network LinkedIn is most used for branding, and during the COVID-19 pandemic for publishing the content of grants, thanks to employees and important information for followers. Support videos and opportunities to use the online service have also been posted on the YouTube channel, as well as on Twitter. Also, the marketing strategies of Zagrebačka banka d.d. on social media during the COVID-19 pandemic. Finally, a conclusion follows in which an analysis of the use of social networks of Zagrebačka banka d.d. during the COVID-19 pandemic.