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The purpose of this research is to determine the form of code mixing used in WhatsApp group conversations among Indonesian students at Al-Azhar University Egypt and the factors causing code mixing in their conversations. This research is literary research using qualitative approach. The data obtained are analyzed using sociolinguistic theories, especially code-mixing. The objects of this research consist of words and sentences found in the conversations. The data, words and sentences, are taken from WhatsApp group named Sufara-Indonesia. In order to get data, researcher utilized documentation method, in which data are collected from WhatsApp conversation, followed by note-taking techniques. The results of the research are mixed language found in 40 sentences. Among the data, 32 are in the form of word, and 5 are in the form of phrases, 3 are clauses.  This research also found that among factors influencing code-mixing are their habit of using their mother tongue, Indonesian language, and their intimacy for they live in the same place far from their home land