2003 Chicago Cubs season Game log May

| Date_ | Opponent | Score | Loss | Attendance | Record |
|---|---|---|---|---|---|
| May 1 | @ Giants | 5 – 1 (10) | Worrell (1–1) | 41524 | 16–12 |
| May 2 | Rockies | 7–4 | Chacón (4–1) | 29236 | 17–12 |
| May 3 | Rockies | 6–4 | Guthrie (0–2) | 38332 | 17–13 |
| May 4 | Rockies | 5 – 4 (10) | Reed (2–1) | 37223 | 18–13 |
| May 5 | Brewers | 5–3 | Clement (2–4) | 35304 | 18–14 |
| May 6 | Brewers | 9–6 | Cruz (1–1) | 34240 | 18–15 |
| May 7 | Brewers | 2–1 | Rusch (1–6) | 37574 | 19–15 |
| May 9 | Cardinals | 6–3 | Zambrano (3–3) | 38531 | 19–16 |
| May 10 | Cardinals | 3 – 2 (10) | Eldred (2–1) | 38106 | 20–16 |