This research discusses the Treaty of Friendship and Good Neighborliness and its impact on Saudi-Iraqi relations 1349 AH / 1931 AD. After the establishment of the Kingdom of Saudi Arabia, the Saudi-Iraqi relations became more important; Where King Abdulaziz worked with King Faisal I to lay a foundation for the two countries in their bilateral relations, and that was the basis of the Treaty of Friendship and Good Neighborliness signed by the two sides in 1349 AH / 1931 AD. Diplomatic representation between the two countries.