Ambush marketing is becoming an increasingly common predatory practice against sponsorships. It is important that managers develop an understanding of the fundamental of ambush marketing and this note is meant to provide this. This note defines and explains the concept of ambush marketing and its typology, It discusses the reasons why firms ambush and the different strategies that they adopt and the impact that ambush marketing has on and around specific events. This note will be useful for participants in courses related to marketing, marketing communication, sponsorship and sports marketing for programmes at graduate level in business management as well as for executive education.