The media landscape wields immense influence as a reflection of social values and a creator of cultural narratives. The extent to which gender is authentically represented in media content directly impacts how individuals form their perception of the world. Traditional gender roles and stereotypes, once deeply ingrained in media, have gradually evolved due to growing societal awareness and activism. This study therefore, examines the stereotypical portrayal of gender in mainstream media and its effects on societal norms. The researchers embarked on this study with the intent of achieving two objectives; and based on the objectives of this study, two research questions were formulated to serve as a guide for this study. This study is anchored on the social learning data. Data were collected using the secondary method of data collection. Findings from this study reveal that mainstream media have a profound impact on shaping societal attitudes and beliefs. The extent and nature of the portrayal of gender and diversity in mainstream media are critical aspects of media analysis. The study further revealed that mainstream media has often perpetuated gender stereotypes. Women have been predominantly portrayed as caregivers, homemakers, or objects of desire, while men have been depicted as breadwinners, leaders, and protectors. Although progress has been made in challenging these stereotypes, they still persist in many forms of media. The study concludes that the portrayal of gender in mainstream media holds significant sway over societal norms. The study therefore, recommends that to address the stereotypical portrayal of gender in mainstream media and its effects on societal norms, it is crucial to encourage greater diversity within media production teams.