Roy Lancaster Curthoys CMG (4 October 1892 – 24 September 1971) was an Australian journalist and newspaper editor.
He began his journalistic career on the Daily News in 1910, later transferring to the West Australian (1916), The Herald (1919), and The Argus (1920).
In 1922 he travelled through Europe and North America as a "special representative" of the AJA, learning about journalism education.
He maintained a good relationship with Keith Murdoch, who gave him a free office and occasionally employed him as a leader writer.
Curthoys was appointed CMG in 1958, after declining an Officer of the Order of the British Empire in 1951.