Richard Methuen Greaves (1852-1942) was a North Wales landowner who owned and managed a major slate mine.
Third son of John Whitehead Greaves (1807–80), owner of Llechwedd quarry at Blaenau Ffestiniog in Merionethshire, and his wife Ellen Stedman (1816-1887), as a young man in 1873 and 1874 he undertook a world trip.
On 24 July 1883 at Wroxall, Warwickshire, he married Constance Mary Dugdale (1862-1947).
In 1881 a magistrate and slate quarry proprietor living at Ty Nanney in Tremadog, in 1885 he succeeded his brother John Ernest Greaves (1847-1945) as general manager of the Llechwedd Slate Quarries.
Greaves was interested in all things mechanical and instigated agricultural and domestic improvements on his estates.