In today's dynamic and competitive business environment, marketing intelligence systems (MIS) are vital tools that empower organizations to understand the market, monitor competitors, identify trends, evaluate performance, and make informed decisions, ultimately contributing to effective marketing strategies, enhanced customer experiences, and sustainable business growth. This chapter discusses the impact of MIS in the tourism industry. It explains how the integration of data and advanced technologies allows these systems to provide insights that can sharpen a tourism organization's competitive edge. The chapter outlines the key components of MIS—data collection, analysis, and decision support—and their role in driving strategic marketing decisions. It also examines how these systems enhance customer segmentation, campaign personalization, pricing, and customer relations, with real-world examples underscoring their efficacy. Challenges of implementation are acknowledged, with the chapter concluding on the need for ongoing innovation and future research in this area.