ABSTRACT:- The study examined the relationship between Ambush Marketing and Marketing Success of fast-food firms in Port Harcourt. One hundred (100) copies of questionnaire were distributed amongst ten (10) selected registered fast-food firms in Port Harcourt. Ninety four (94) copies were retrieved and useful for the study. Pearson Product Moment Correlation Coefficient was used to analyse the data. The analysis revealed that there is a strong and positive relationship between blatant marketing and the measures of marketing success and also there is a strong and positive relationship between subtle marketing and measures of Marketing Success of fast- food firms in Port Harcourt.The study therefore, concludes that the dimensions of ambush marketing to a large extent influences marketing success, thus, it was established that a positive and significant relationship exist between ambush marketing and marketing success.The study further recommends that there should a reduction in the range of sponsorship arrangement. Secondly, Marketers should see ambush marketing as a competitive advantage over their rivals

KEYWORDS: Ambush Marketing, Blatant Marketing, Subtle Marketing, Marketing Success.