Sir John Fowler, 1st Baronet (15 July 1817 – 20 November 1898) was an English engineer specialized in the construction of railways and railway infrastructure. During the Victorian era, he was engineer for the world's first underground railway, the London's Metropolitan Railway.
Due to his experience with railway engineering, John Fowler was a candidate for chief engineer of the Metropolitan Railway. However, as he pointed out to the solicitor Charles Pearson, his experience might have been unnecessary in the ambitious construction of underground railway.
By 1860, with the injection of money from several railing companies, Fowler was hired to be the chief engineer of the Metropolitan Railway Company and started to work on the first shaft at Euston. Despite the probability of causing loss of houses and inaccessible roads in the surface, John Fowler decided to pursue the technique of "cut and cover" which involved sinking of trenches and reinstating the surface.
In 1862, John Fowler, who was showing the progress of the underground railway to Charles Pearson and his wife, was present when the body of Robert Waugh was discovered on the construction site. They then informed the Metropolitan Police Frederick Abberline to investigate the scene.