Guerrilla marketing uses all elements of marketing to recognize their effectiveness in certain conditions and maximizes successful elements, while minimizing less successful elements. In addition, it recognizes good opportunities and solves problems and is economical because, instead of a large budget, it uses good ideas and hard work. Guerrilla marketing is characterized by a surprise factor that arises from the application of new creative ways of running a marketing campaign with the purposeful use of all channels through which the marketing message can be transmitted, as well as a good combination of various means of communication to achieve their synergistic effect. The subject of the research are selected examples of guerrilla marketing communication on the Croatian market, with special emphasis on the implementation of guerrilla marketing communication and analysis of financial results, on the examples of the campaign of Zagreb Brewery ("Start with a reason") and Erste Bank ("Believe in yourself"). To examine the research problem, in-depth interviews and a survey were conducted, which examined consumers' familiarity with guerrilla marketing and their opinion on these campaigns. Both companies use both communication elements and major guerrilla marketing factors, as confirmed by in-depth interviews conducted. Consumers did not report the impact of campaigns on them as consumers, while the financial aspects of the "Scratch for a Reason" campaign conclude that the campaign had a significant and strong impact, while financial campaign indicators, especially Zagrebačka pivovara, indicate an impact on consumer behavior.