Sibbeston (born November 21, 1943) is a retired Canadian Senator representing the Northwest Territories.
He was nominated to the Senate by Liberal prime minister Jean Chrétien in 1999 and sat until 2017, when he resigned on his 74th birthday, a year prior to reaching the mandatory retirement age.
Prior to that, he was Premier of the Northwest Territories from 1985 to 1987.
He was also a Member of the Legislative Assembly in the Northwest Territories representing Mackenzie-Laird from 1970 to 1975 and from 1979 until 1991.