Who has been President of the US twice?

Many Presidents have been re-elected to a second term:

Washington, Jefferson, Madison, Monroe, Jackson, Lincoln, Grant, McKinley, Wilson, FDR, Eisenhower, Nixon, Clinton, and George W. Bush.

Some have succeeded to the office and then been re-elected:

Teddy Roosevelt, Calvin Coolidge, Harry Truman, Lyndon Johnson.

Only one was elected twice, noconsecutively :

Grover Cleveland, who is considered both the 22nd and 24th US President.