This study aims to disclose the cultural reflection of post-colonialism in F. Scott Fitzgerald’s novel, The Great Gatsby. This research uses analytical approach of post-colonial literature in the form of colonial behavior passed down to the weak, namely the colonized who consciously or unconsciously becomes the object of ideological oppression and power hegemony. The data collection techniques were reading, identifying, classifying, interpreting, inferring. The results of the analysis of events in the novel suggest that the descriptions of the colonized ideology are in the forms of hybrid ideology, mimicry, ethnicism, racism, sexism, and classism. The author describes that Gatsby has reflected ideology of hybrid, mimicry, racism, and ethnicism in his struggle to change his social status to be a rich man designated as the Jazz to attract Desy, his former girlfriend who has left him to marry Tom who has reflected ideology of classism and sexism to the colonialized native inhabitant.