Critical discourse analysis (CDA) is a relatively recent development in the study of language. Its aim is to uncover the underlying power structures present in both spoken and written discourse. Advertising, as a particular type of discourse constructed on persuasive grounds, is expected to be a reflection of people’s ideology and thinking style, especially in the context of radical sociopolitical changes across various spheres of society. Advertisements from the pre- and post-revolutionary eras were selected to identify trends and highlight the radical shift in discourse. The daily papers investigated included “Iran” daily in 1979 and Jāme Jam, Āftābe Yazd, and Hamshahri—all published after the revolution. The advertisements were described in terms of design, content, and format. Fairclough’s critical discourse analysis (CDA) approach was applied to study the general content of advertisements. The results indicated that the post-revolutionary advertisements exhibited a notable divergence from those of the pre-revolutionary era in terms of the utilization of parts of speech. Further analysis revealed that in the wake of post-national and postmodern shifts in people’s ideologies and beliefs, the Islamic paradigm has pervasively influenced Iranian lifestyles, with postmodernist principles serving as a conduit for these effects. The trend shift analysis also substantiated the emergence of consumerism, indicating that products have increasingly become a conduit for ideology.