The transition of political communication from traditional channels to the Internet and social networks has brought great changes in terms of political campaigning. Internet campaigns are subjected to a series of trends. One such trend according to Ansolabehere and Iyengar (1995) is the growth of negative campaigns. This paper will try to identify exactly that trend in the second round of local elections in 2021 in Split. For this purpose, a research was carried out which, using the quantitative method of content analysis, investigated whether there are indicators that point to the existence of the mentioned trend in the Facebook posts of the two candidates who won the largest number of votes in the first round of the election for mayor of Split and entered the second round of the election, Vice Mihanović and Ivica Puljak. In addition to posts on the social network Facebook, which is still the most popular social network for obtaining news in the Republic of Croatia (Newman et al., 2021: 70-71), indicators of the existence of negative communication were also sought in the TV debate between the two candidates using the quantitative method of content analysis. who entered the second round of local elections in 2021 in Split. Besides being a very important part of political communication, TV debates are the result of the interaction of local culture and global trends precisely in the field of political communication (Juarez-Gamiz et al., 2020: 3), they have a "strategic role in contemporary political campaigns" ( Juarez-Gamiz et al., 2020: 3). Therefore, the units of analysis in this paper are candidates' Facebook posts and one candidates' answer to a question during a televised interview. A total of 81 posts and 104 responses were analyzed. The conducted research found that the use of negative political communication in posts on the Facebook profiles of both candidates was dominant, while the dominance of negative sentiment was absent in the TV debate. The conducted research provides an insight into the concrete application of negative political communication.