Charles Frewen Jenkin, CBE, FRS (24 September 1865 – 23 August 1940) was a British engineer and academic.

[1] Upon graduation, Jenkin joined Mather & Platt, an engineering company based in Manchester.

He then worked for London and North Western Railway based in Crewe, having been granted a Miller scholarship from the Institution of Civil Engineers.

[1] In 1891, he joined the Royal Gunpowder Factory in Waltham Abbey as a mechanical assistant superintendent.

[2] He ended his time with them as head of Siemens's railway department and manager of the works based in Stafford.

[2][1] On 21 May 1908, Jenkin was elected to the newly constituted position of professor of sngineering science at the University of Oxford.

[1] In May 1915, Jenkin was granted a temporary commission in the Royal Navy Volunteer Reserve in the rank of lieutenant.

[1] His younger son Conrad Jenkin (1894–1916) died while serving in the Royal Navy during World War I.

[1] During World War I, at some time between May 1915 and March 1919, he was appointed Member of the Order of the British Empire (MBE).

[6][8] In the 1919 King's Birthday Honours, he was promoted to Commander of the Order of the British Empire (CBE) 'in recognition of distinguished services rendered during the war'.