Robert John Billinton (5 April 1844 – 7 November 1904) was the Locomotive, Carriage, Wagon and Marine Superintendent of the London, Brighton and South Coast Railway from 1890 until his death.
He then became assistant works manager to Munro, Walker and Easton of Sheffield where he was responsible for the design and building of locomotives and stationary engines.
In 1870 Robert Billinton was appointed assistant to William Stroudley at the Brighton Works of the LB&SCR.
In 1874 he moved to become the assistant of Samuel Waite Johnson of the Midland Railway, at Derby.
His son, Lawson B. Billinton (1882–1954) was also the Locomotive Engineer to the LB&SCR from 1912 until his retirement in 1922