Alexander MacDonald "Sandy" Keith (November 22, 1928 – October 3, 2020) was an American politician and jurist who was the first person to hold office in each of the three branches of Minnesota state government, serving as state senator, the 37th Lieutenant Governor, and as an associate justice and later chief justice of the Minnesota Supreme Court.

Keith graduated magna cum laude from Amherst College in 1950, and from Yale Law School in 1953.

[3] After returning to his hometown of Rochester, Keith took a job as counsel with the Mayo Clinic, where he worked with future U.S. Supreme Court Justice Harry Blackmun.

In 1959, he was elected to the Minnesota State Senate as a member of the Democratic-Farmer-Labor Party (DFL).

During his tenure as a state senator, Keith served as a delegate to the 1960 Democratic National Convention.