Bioengineering (also known as Biological Engineering) is the application of engineering principles to address challenges in the fields of biology and medicine. As a study, it encompasses biomedical engineering and it is related to biotechnology.

Bioengineering applies engineering principles to the full spectrum of living systems. This is achieved by utilising existing methodologies in such fields as molecular biology, biochemistry, microbiology, pharmacology, cytology, immunology and neuroscience and applies them to the design of medical devices, diagnostic equipment, biocompatible materials, and other important medical needs.

Bioengineering is not limited to the medical field. Bioengineers have the ability to exploit new opportunities and solve problems within the domain of complex systems. They have a great understanding of living systems as complex systems which can be applied to many fields including entrepreneurship.

Much as other engineering disciplines also address human health (e.g., prosthetics in mechanical engineering), bioengineers can apply their expertise to other applications of engineering and biotechnology, including genetic modification of plants and microorganisms, bioprocess engineering, and biocatalysis. However, the Main Fields of Bioengineering may be categorised as: