The chapter explores the nanotechtonic applications to address microbial challenges in different areas such as healthcare, agriculture, food production, and environmental safety. Conventional anti-microbial solutions are limited today due to increasing antimicrobial resistance (AMR), biofilm formation, and environmental persistence of harmful microbes. Nanotechtonics integrates nanotechnology with material science and molecular engineering to offer versatile solutions to the microbe-caused issues. Nano-based anti-microbial agents are classified into organic, inorganic, carbon-based, lipid and polymer-based nanomaterials. The unique anti-microbial properties and mechanisms of each nanoplatform such as cell membrane disruption, reactive oxygen species (ROS) generation and targeted drug delivery are discussed. Fabrication methods such as plasma arcing, chemical vapor deposition and self-assembly emphasize importance of surface properties in nanomaterial-microbe interactions. The practical applications of nanomaterials in medical devices, wound care, drug delivery, food preservation and water purification are examined. Alongside the challenges of cost-efficient production, potential toxicity and biocompatibility which sets the stage for future research in the field.