|| 38–34 |- style="background:#bfb" | 73 || June 29 || @ Mets || 5–2 || Bob Buhl (4–4) || Rob Gardner (2–6) || Darold Knowles (6) || 13,918 || 39–34 |- style="background:#bfb" | 74 || June 30 || @ Mets || 1–0 || Chris Short (9–4) || Bob Shaw (5–5) || None || 19,895 || 40–34 |- |- style="background:#bfb" | 75 || July 1 || Cubs || 7–0 || Larry Jackson (5–7) || Bill Faul (1–3) || None || 10,670 || 41–34 |- style="background:#bfb" | 76 || July 2 || Cubs || 12–9 || Rick Wise (2–3) || Dick Ellsworth (3–11) || Ray Herbert (1) || 4,251 || 42–34 |- style="background:#bfb" | 77 || July 3 || Cubs || 6–2 || Bob Buhl (5–4) || Curt Simmons (2–2) || Darold Knowles (7) || 5,058 || 43–34 |- style="background:#fbb" | 78 || July 4 (1) || Mets || 6–9 || Bob Shaw (6–5) || Chris Short (9–5) || Jack Hamilton (7) || see 2nd game || 43–35 |- style="background:#fbb" | 79 || July 4 (2) || Mets || 1–8 || Jack Fisher (6–8) || Ray Culp (3–4) || None || 19,208 || 43–36 |- style="background:#bfb" | 80 || July 5 || Mets || 3–1 || Larry Jackson (6–7) || Bill Hepler (1–1) || None || 8,047 || 44–36 |- style="background:#fbb" | 81 || July 6 || Mets || 5–7 || Darrell Sutherland (1–0) || Darold Knowles (6–2) || Jack Hamilton (8) || 12,469 || 44–37 |- style="background:#fbb" | 82 || July 7 || Mets || 6–9 || Gerry Arrigo (2–1) || Ray Herbert (1–3) || None || 7,447 || 44–38 |- style="background:#bfb" | 83 || July 8 || @ Cubs || 5–4 || Chris Short (10–5) || Ken Holtzman (3–9) || Darold Knowles (8) || 5,166 || 45–38 |- style="background:#bfb" | 84 || July 9 || @ Cubs || 11–6 || Larry Jackson (7–7) || Bill Hands (5–8) || Darold Knowles (9) || 7,193 || 46–38 |- style="background:#fbb" | 85 || July 10 || @ Cubs || 2–10 || Dick Ellsworth (4–12) || Jim Bunning (9–5) || None || 13,863 || 46–39 |- style="background:#bbcaff;" | – || July 12 ||colspan="7" |1966 Major League Baseball All-Star Game at Busch Memorial Stadium in St. Louis |- style="background:#bfb" | 86 || July 14 || Giants || 5–0 || Larry Jackson (8–7) || Gaylord Perry (12–2) || None || 24,347 || 47–39 |- style="background:#fbb" |