Developed by making use of internet technology and used in new media, social networks have startedto draw the attention of political actors with features that distinguish them from traditional media,and have become one of the political communication tools. One of the social networks that createsa participation environment, YouTube is used by leaders and members of political parties for thepurposes of reaching to the electorate and gaining their support. Accordingly, the research aims toinvestigate how Binali Yıldırım, the candidate of People’s Alliance, and Ekrem İmamoğlu, the candidateof Nation’s Alliance, use YouTube social media within the scope of their political campaign practicesfor Istanbul Metropolitan Mayorship election, which was repeated in June 23, 2019. In this context, asthe research sample, total of 209 videos – which were shared during the period between May 6, whenIstanbul election was cancelled by Supreme Election Board (YSK) and June 23, 2019, the date on whichthe election was repeated – are examined with the qualitative content analysis technique. As a result ofthe research, it was understood that İmamoğlu used YouTube platform more actively than Yıldırım interms of both the number of videos shared and interaction status, and as far as the type of shared contentis concerned. As a result of the analysis on shared content in the category of political advertising, it wasunderstood that İmamoğlu used advertisements more actively for promoting past and future activitiesand adopted suggestion strategy, while Yıldırım preferred advertisements promoting the activities inthe past and he mostly made use of image creation strategy.