Since its establishment in 1921, Iraq’ s borders were incorporated by a diverse medley of people who had not been joined into a single political community with a common sense of identity. For the Iraqi rulers, the education system was the most important and the best tool for expanding a common national identity. As a result, a centralized education system was created, new schools were developed, and new education with nationalist content was spread from Baghdad to other parts of the country. In the present study, the descriptive-analytical method was used and the data were collected through library sources to answer two research questions: how nationalism and the infusion of national identity were started and expanded in the Iraqi society? And what goals and motives did the nationalists have to promote nationalism in Iraq? The results showed that Arab nationalists, such as Sati' al-Husri, Fazel Jamali and Sami Shawkat, along with Syrian and Palestinian nationalists, who taught in Iraq, played an important role in the development of national identity. They expanded a common national identity with the foundation of Arabism by teaching the common Arabic history and the language developed for the curriculum. Ultimately, the spread of nationalism pursued two important goals: to create a shared identity in Iraq's multi-ethnic society and to emphasize its role in Arab unity.