Michel Victor Pachon (May 26, 1867 – 1938) was a French physiologist born in Clermont-Ferrand.
In 1892 he earned his doctorate at the University of Paris, and later became a chief assistant in Paris to physiologists Charles Richet (1850-1935) and Eugène Gley (1857–1930).
In 1911 he became a professor of physiology at the medical faculty of the University of Bordeaux.
Pachon is remembered for his work involving blood pressure and oscillometry; which is defined as the measurement of oscillations used in cardiovascular and respiratory physiology.
In 1909 Pachon developed a sphygmographic oscillometer for measuring arterial blood pressure.
Pachon's oscillometer was widely used by doctors and technicians during the first half of the twentieth century.