The postcolonial writings tend to challenge the simplified representations of the natives and their cultures in the colonialists discourses. These writings celebrate the native pre-colonial culture and society to assert that these communities were not without history, heritage or identity of their own, as claimed by the colonialists. The postcolonial writings reflect the pride of the writer and the community in their own culture and heritage. These narratives also describe the colonialists and their culture from a new perspective. The postcolonial writings also depict the resistance of the natives towards the colonialist ideologies and cultures. Chinua Achebe is an African postcolonial writer. His novel Things Fall Apart is one of the best postcolonial novels and has the status of an African classic piece of writing. It has all the major characteristics of a postcolonial discourse. The present study intended to investigate the portrayal of African culture and identity in this novel and Achebe's response towards the colonialist ideology and culture, in the light of Postcolonial theories. The study found that Achebe has presented the African culture from the native perspective and has shown that Igbo culture and people had their own distinct culture, history and civilisation. However, the study also showed that Achebe has also dwelt upon some of the negative features of the pre-colonial Igbo culture, suggesting that it needed to be reformed and changed. He himself has an ambivalent attitude towards the colonialist ideology and culture, reflecting the fact that he has internalised the colonialist ideology and culture.