When the Islamic dimension in the literature by Kazi Nazrul Islam of Bangla literature is considered, there have been concentrations on his Sufi and mystic self, and his propagation of economic system and removal of social injustice, remaining fixed in his Islamic standpoint. There has also been attempt to depict Nazrul as a poet of humanity, putting aside his Muslim identity. But the poet’s solid faith in and deep knowledge of Islam as expressed in his Islamic songs is also a conspicuous dimension of his literature. Besides writing Islamic songs, Nazrul also writes songs on Hindu religious tradition and does anti-colonial struggle. As a result, it becomes an imperative to examine the nature of Nazrul’s Islamic spirit. So, this research mainly sheds light on the Islamic songs by Kazi Nazrul Islam and studies them from the perspectives of The Holy Qur’an and the Sunnah in order to understand the nature of his Islamic spirit. The research also gives effort to explore whether the poet’s Islamic spirit has prompted him to be all-inclusive by writing songs on Hindu religious tradition, and to do anti-colonial struggle. This is how the research finds that the spirit expressed in Nazrul’s Islamic songs is quintessentially Islamic.  Here library research with analytic methodology was adopted.