Hebrew and Arabic met on several occasions throughout history in bilingual or multilingual societies. This course focuses on mutual influence of Hebrew and Arabic, in written production and speech, in the past and in present day Israel. We will survey Hebrew-Arabic contact in the Middle East and North Africa, analyzing specific cases, such as Samaritan Arabic and Hebrew, Judeo-Arabic languages and Hebrew varieties spoken by Jews in Syria, Iraq, Yemen, Egypt, Libya, Algeria, Tunisia and Morocco. We then tackle the development of Arabic Hebrew varieties spoken in the Middle Eastern and North African Diaspora after their speakers moved to Israel and -  over a few generations - shifted to the normative use of Modern Hebrew. The course also discusses some semantic aspects of the contact between Modern Hebrew and local Arabic varieties (Rural, Bedouin, Urban) in Israel today.