ABSTRACT Moh. Fajar Shodik, 2021, An Analysis of Using Code Mixing in a Conversation by Campus Ambassador at IAIN Madura, Teaching English, Teaching Learning Program (TBI), Tarbiyah Faculty, State Islamic Institute of Madura. Advisor. Mulyadi, SS. M. Pd. Key words: Sociolinguistics, Code Mixing, Conversation, Campus Ambassador. Sociolinguistics study about the relationship between language…