Samuel Timothy Johnston OY (born November 20, 1935)^[1] is a former Canadian politician in the territory of Yukon, Canada. He served as chief of the Teslin Tlingit Council from 1970 to 1984,^[2] and represented Campbell in the Yukon Legislative Assembly from 1985 to 1992 as a NDP member.

He was born in Teslin, Yukon, the son of David Peter Johnston and Rose Morris, and was educated in Carcross. In 1983, he married Kelly Ruth Hyatt.^[1] Johnston served as Speaker for the assembly from 1985 to 1992. He was the first native Canadian to serve as a legislative speaker in Canada.^[3]

In the 1992 election, Johnston was defeated by independent Willard Phelps in the redistributed riding of Ross River-Southern Lakes.^[4]

He served as chancellor for Yukon College from 2004 to 2008.^[5]

Johnston also competed in archery at the North American Indigenous Games and was a coach at the North American Indigenous Games and the Arctic Winter Games. He was inducted into the Sport Yukon Hall of Fame in 2003.^[6]

He was made a member of the Order of Yukon in 2019.^[7][8]