Sir William Jenner, 1st Baronet (30 January 1815 – 11 December 1898) was a significant English physician primarily known for having discovered the distinction between typhus and typhoid.

Jenner was born at Chatham on 30 January 1815, and educated at University College London.

He was president of the Royal College of Physicians from 1881 to 1888 where he had delivered the Goulstonian Lectures in 1853.

[2] As a consultant, Sir William Jenner had a great reputation, and he left a large fortune when he died, at Bishops Waltham, Hants, on 11 December 1898, having then retired from practice for eight years owing to failing health.

[1] His son, Leopold, was a decorated Army officer of the First World War.