Cornwallis Hewett FRSC (1787 – 13 September 1841) was a physician who served as Downing Professor of Medicine and Physician-Extraordinary to the King.

[1] His younger half-brother Prescott Gardner Hewett also served as Physician-Extraordinary as well as Serjeant Surgeon.

[2] Even though his father's change in fortune meant that he had to remove to France, he still managed to have a strong education at Charterhouse School followed by matriculation at Trinity College, Cambridge in 1806, and received his Bachelor of Arts degree in 1809 with a Members' Prize.

[2] Hewett was also appointed a Fellow and Tutor at Downing College, Cambridge in 1814 and later he received his Doctorate of Medicine in 1822.

[5] His distinguished career although outdone by his younger half-brother Prescott Gardner Hewett did inspire him to also join St George's Hospital in his wake.