Along with the development of science and technology, people start inventing many ways to interact. Presently, there have been created various many types of media in helping their communication activity, one of them is Instagram. This paper aimed to analyze the language styles used in NetflixId Instagram posts caption to interact with their audiences. This research is qualitative research and the data were collected by time-stamp from 8th August-31st August 2021. The researcher used a theory from Martin Joos (1976) about types of language styles. The results showed that there were 4 types of language styles that used in NetflixId Instagram account, they are: formal style (9 data), consultative (20 data), casual (61 data) and intimate (2 data). The caption dominantly used casual language style in writing their Instagram captions as a tool to interact with their audiences.Keywords: Instagram Caption; Language Style; NetflixId