2003 Chicago Cubs season Game log June

| Date_ | Opponent | Score | Loss | Attendance | Record |
|---|---|---|---|---|---|
| June 14 | @ Blue Jays | 4–2 | Davis (3–4) | 33167 | 37–29 |
| June 15 | @ Blue Jays | 5 – 4 (10) | Guthrie (0–3) | 34221 | 37–30 |
| June 16 | @ Reds | 4–3 | Anderson (1–3) | 28669 | 38–30 |
| June 17 | @ Reds | 2 – 1 (10) | Remlinger (4–1) | 28999 | 38–31 |
| June 18 | @ Reds | 4–1 | Haynes (1–6) | 39053 | 39–31 |
| June 19 | @ Reds | 3–1 | Prior (8–3) | 41692 | 39–32 |
| June 20 | White Sox | 12–3 | Estes (6–6) | 39080 | 39–33 |
| June 21 | White Sox | 7–6 | Clement (5–7) | 38938 | 39–34 |
| June 22 | White Sox | 2–1 | Marté (2–1) | 38223 | 40–34 |
| June 24 | Brewers | 9–1 | Quevedo (1–4) | 40389 | 41–34 |
| June 25 | Brewers | 12 – 6 (10) | Wellemeyer (1–1) | 38357 | 41–35 |