Christianity is one of the greatest religions in the world with more than 2.3 billion followers around the globe. This dictionary provides scholars, translators, researchers and readers with the most important and relevant terminologies on Christianity both in English and Arabic. It is simple and easy to use as terminologies could be looked up both in English and Arabic. The dictionary also includes useful definitions and illustrations for the most important terms to make it easy for non-specialists to understand. Researchers can look up the meaning of any word both in English and Arabic as the dictionary is divided into two sections: English-Arabic and Arabic English. It is hoped that this work that includes two dictionaries within the same book, would be of great help to those interested in writings on the Christian faith both in English and Arabic.