This study explores the impact of marketing on consumer behaviour with specific reference to fast-moving consumer goods (FMCGs). In a highly competitive market environment, effective marketing strategies play a critical role in influencing consumer decisions. The research aims to examine how various marketing elements such as product quality, pricing, promotion, packaging, and digital marketing affect consumer behaviour in terms of purchase intention, brand loyalty, customer satisfaction, and impulse buying behaviour. A quantitative research approach was adopted, and primary data was collected through structured questionnaires from consumers in urban and semi-urban areas. Using statistical tools like correlation and regression analysis, the study found that marketing activities have a significant and positive impact on all four consumer behaviour dimensions. Among them, brand loyalty exhibited the strongest association with marketing efforts. The findings emphasize the importance for FMCG companies to design targeted and consumer-centric marketing strategies that not only attract new customers but also retain existing ones. This research contributes to a better understanding of the strategic role of marketing in driving consumer behaviour in the FMCG sector.