John Williamson, born 1937, is an economist and the originator of the Washington Consensus. He is a critic of capital liberalization and bipolar exchange rate.

John Williamson (? - 1871) was a New Zealand politician. He represented the "Pensioner Settlements" (consisting of the Auckland suburbs of Howick, Onehunga, Otahuhu, and Panmure) in the 2nd New Zealand Parliament, and represented the City of Auckland East electorate in the 3rd Parliament, the 4th Parliament, and the 5th Parliament. He was a minister without portfolio in the government of William Fox, and also participated in the Auckland provincial politics.

Dr. John Thornburn Williamson (1907-1958) was a Canadian geologist famous for establishing the Williamson diamond mine in present-day Tanzania.