Natural excipients, derived from plant, animal, and marine sources, are increasingly favored in pharmaceutical formulations due to their biocompatibility, non-toxicity, cost-effectiveness, and sustainability. They serve as essential components in drug delivery systems, functioning as binders, disintegrants, diluents, lubricants, and coating agents. Compared to synthetic alternatives, natural excipients enhance bioavailability, solubility, and permeability while offering additional nutritional benefits. Plant-based gums, mucilages, and polysaccharides are extensively used in controlled and novel drug delivery systems, whereas marine and animal-derived excipients provide unique properties beneficial for specialized formulations. The pharmaceutical industry’s shift toward natural products, coupled with regulatory ease, has accelerated the adoption of these excipients. Their physicochemical properties improve drug stability, release, and patient compliance, making them vital for solid dosage forms like tablets and capsules. However, challenges such as variability in composition, stability concerns, and compatibility issues limit their widespread use. Advances in chemical modification, nanoformulations, and hybrid excipient development aim to overcome these limitations. Regulatory considerations and quality control measures remain crucial to ensuring the safety and efficacy of natural excipients in drug formulations. Additionally, sustainable sourcing and innovative research offer promising opportunities for their expanded application. This chapter provides a comprehensive analysis of the challenges, enhancement strategies, regulatory aspects, and emerging trends in the utilization of natural excipients for pharmaceutical development.