William Ferguson Massey, often known as Bill Massey or "Farmer Bill" (26 March 1856 – 10 May 1925) serves as the 19th Prime Minister of New Zealand from 1912 to 1925, and is the founder of the Reform Party.
He is widely considered to have been one of the more skilled politicians of his time, and is known for the particular support he shows towards rural interests.
After Richard Seddon, he is to date the second longest serving Prime Minister in New Zealand's history.