This chapter explains how healthcare providers can measure and improve the return on investment (ROI) from digital marketing campaigns. It introduces the ROI formula and applies it to healthcare-specific settings, showing how to align marketing efforts with clinical and business goals. The chapter covers strategic planning using the SMART framework, understanding patient preferences, and selecting appropriate digital marketing channels such as SEO, PPC, social media, email, mobile apps, and websites. Strategies for optimizing ROI in each channel are detailed, along with guidance on using key performance indicators (KPIs) to track outcomes. It explores analytics tools, tracking systems, and AI applications for data analysis, predictive modeling, personalization, and real-time campaign optimization. The chapter also addresses advanced ROI calculations, including patient lifetime value, and navigates privacy, compliance, and ethical challenges unique to healthcare marketing. Case studies illustrate how analytics improve campaign performance. The chapter concludes with future trends such as AI integration, digital transformation, and voice search, emphasizing continuous testing, adaptation, and patient-centered communication to improve both marketing outcomes and patient care.