Ralf Dieter Speth KBE FRS (born 9 September 1955[3]) is a German automotive executive and a director of Indian company Tata Sons since 2016.

He was also chief operating officer and a member of the executive board at its subsidiary KION Group GmbH.

In the 2015 Special Honours list, Speth was appointed an honorary Knight Commander of the Order of the British Empire for his services to the automotive industry.

[16] He entered into a non-executive role in the company and was succeeded by the CEO of Renault, Thierry Bolloré.

[18] In April 2022, Speth took over the role of chairman of Indian automaker TVS Motor Company, succeeding Venu Srinivasan.