This writing is motivated by the importance of athics in communing in everyday life. The existence of communication that is carried out requires a basis that is in accordance with the Quran so that communication can benefit others. Ethics has a function as a theory or basis of good and bad behavior. As well as in this writing examines the thoughts of Fakhruddin al Razi in his work entitle Mafatih al Ghaib. This writing is literary in nature using the library reseaerch method which examines thoughts about communication ethics based on the thoughts of Fakhruddin al Razi in his work entitled Mafatih al Ghaib using a philosophical approauch to the figures studied. The result of this writing is that ethics is defined as the ability of the soul that can require someone to do good or easy deeds in everyday life by paying attention to the ethical principles of communicating in the Quran including the principles of qoulan sadidan, qoulan ma’rufan, qoulan layyinan, qoulan kariman, qoula balighan, qoulan mausuran. Ethics in learning according to Fakhruddin al Razi include students must have the nature of tawadhu’, ask permission from the teacher during learning, feel stupider than the teacher, belive in the knowledge coveyed by the teacher, believe that Allah bestows knowledge on the teacher, obey the teacher, be grateful for favors from Allah in seeking knowledge on the teacher, serving the teacher. Likewise, teacher must also have good ethics towards students, including teachers need to understand students, whether they have a lot of knowladge or vice versa.