The main argument in this paper is to deal with Diary of a Bad Year(2007) by J. M. Coetzee (1941- ) both as a polyphonic and hypertextual text. Coetzee’s knowledge of literature and his ability to adjust different texts with each other is manifested in his novel, which is an intermixture of infinite heterogeneous intertexts and refers to his deliberate borrowing of words, themes, plots, or othertextual material from one text to another. Diary of a Bad Year, as a polyphonic intertext, shows the plurality of meaning of signs. This study uses theories of Mikhail M. Bakhtin (1895 -1975) who argues that each text is connected to previous and next texts and no sign lives in isolation, but it carries limitless previous written and unwritten texts. Diary of a Bad Year is a book in which textual and pictorial contexts are intertwined. According to Roland Barthes (1915-1980),“[a]ny text is a new tissue of past citations”(1981:39); i.e., every text is generally characterized by transforming and reworking some features of the original text(s). In this way, Coetzee’s Diary of a Bad Year is not excluded from such a statute. Diary of a Bad Year can certainly be defined, in Bakhtin’s words, as a “plurality of independent and unmerged voices and consciousnesses, a genuine polyphony of fully valid voices” (6). Since Coetzee’s works are the place of the intersection of several sources and the mixture of preceding texts and signs, having a complex structure which weaves multiple voices, in relation to other works. The strategy of intertextuality in Diary of a Bad Year aims at rereading, bringing into question and recycling its source texts in order to give them new meanings. Diary of a Bad Year is an example of Coetzee’s novels, which are involved in an intertextual relationship with other works and as a text which is the continuum of other texts. Humanity, hope and incarnation are the elements considered as an intertext in the works of Coetzee that are going to be analyzed based on the viewpoint of Bakhtin, Barthes, and Gerard Genette (1930- ).