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