In recent years, there has been a growing exploration of biocompatible nanocomposites, encompassing inorganic and organic nanomaterials as well as nanohybrids, for their potential applications in various fields. These applications include biosensors, electromagnetic shielding in aerospace, sensor devices, drug delivery systems, and food packaging. This interest is largely attributed to their superior properties, which include high mechanical strength, thermal stability, barrier effectiveness, antimicrobial activity, and antioxidant capabilities. A biosensor represents a groundbreaking diagnostic instrument that integrates the principles of biology and technology to identify and measure specific analytes. This capability facilitates real-time monitoring, early disease detection, and the development of novel applications. Recent advancements in biocompatible materials have brought a substantial transformation in the evolution of biosensors. Nonetheless, the implementation of biocompatible nanocomposites is hindered by challenges related to scalability, manufacturing methodologies, and long-term stability. This book chapter emphasizes the transformative potential of biocompatible materials in enhancing biosensing and other technological applications across diverse domains within science and technology.