1966 U.S. Open (golf) Second round Second round

| Place | Player | Country | Score | To_par |
|---|---|---|---|---|
| T1 | Billy Casper | United States | 69-68=137 | –3 |
| T1 | Arnold Palmer | United States | 71-66=137 | –3 |
| T3 | Phil Rodgers | United States | 70-70=140 | E |
| T3 | Rives McBee | United States | 76-64=140 | E |
| T5 | Jack Nicklaus | United States | 71-71=142 | +2 |
| T5 | Johnny Miller (a) | United States | 70-72=142 | +2 |
| T7 | Julius Boros | United States | 74-69=143 | +3 |
| T7 | Dave Hill | United States | 72-71=143 | +3 |
| T7 | Kel Nagle | Australia | 70-73=143 | +3 |
| T10 | Bob Goalby | United States | 71-73=144 | +4 |
| T10 | Al Mengert | United States | 67-77=144 | +4 |