Biorheology is the study of flow properties (rheology) of biological fluids. The term was first proposed by Alfred L. Copley, a German-American medical scientist, at the first International Congress on Rheology in 1948.

Biorheological research aims to determine and characterize the dynamics of physiological processes at all levels of biological organization, and the inter-relationships between rheological properties of various biological systems. Biorheological studies can include both animal and plant systems, and can be in broad contexts like the rheology of macromolecules and macromolecular arrays, or in narrower contexts like the rheology in cells, tissues or organs.

The biorheological approach applies in particular to molecular studies where changes of physical properties and conformation are investigated without reference to how the process actually takes place. Biorheological analyses include study of pathological processes through clinical research in the related fields of hemodynamics and hemorheology, and may have clinical implications in aiding the treatment of specific diseases.

• Alfred L. Copley, a German-American medical scientist who first proposed the term "biorheology".
• Hemorheology, the study of flow properties of blood and its elements.
• Biorheology (journal), a scientific journal in the field of biorheology

• International Society of Biorheology
• Bulgarian Society of Biorheology
• Copley, Alfred L. (1 January 1985). "Biorheology, Western medicine and acupuncture". Acupuncture & Electro-Therapeutics Research. 10 (4): 279–296. doi:10.3727/036012985816714360. PMID 2871699.