Donald William Samuelson was an American Republican politician who served as the 25th governor of Idaho, from 1967 to 1971. He is the state's most recent incumbent governor to lose a re-election bid (1970).

The 1970 Idaho gubernatorial election took place on November 3 to elect the governor of Idaho, concurrently with other scheduled governor races, as well as Idaho's two congress members in the House of Representatives and a number of statewide offices. Incumbent Republican governor Don Samuelson sought re-election to a second consecutive term as governor. Although he faced a primary challenger, former state senator Dick Smith, he received more than 58 percent of the primary vote, and thus secured the party's re-nomination.