Harold Saxton Burr (April 18, 1889 – February 17, 1973) was E. K. Hunt Professor of Anatomy at Yale University School of Medicine and researcher into bio-electrics.

Burr is noted for his use of the voltmeter to detect the electric potential of the body, first reported upon in his 1936 paper (with C. T. Lane and L. F. Nims) "A Vacuum Tube Micro-voltmeter for the Measurement of Bio-electric Phenomena".

"[2] Burr's research contributed to the electrical detection of cancer cells, experimental embryology, neuroanatomy, and the regeneration and development of the nervous system.

His late studies of the electrodynamics of trees, carried out over decades, suggested entrainment to diurnal, lunar and annual cycles.

[5] His book Blueprint for Immortality, published late in his career though he based it upon work carried out over decades, contended that the electro-dynamic fields of all living things, which may be measured and mapped with standard voltmeters, mold and control each organism's development, health, and mood.

His early work shows the influence of his friend George Bruestle while his later paintings, now often in pastel rather than oil, became more abstract in design.