The Oakland Athletics finished 1st in the AL West in 2003 with a record of 96-66. They won their division.
AL East
| TEAM | W | L | PCT | GB | HOME | ROAD | L10 | STRK | |
|---|---|---|---|---|---|---|---|---|---|
 | y-Yankees | 101 | 61 | .623 | 0.0 | 50-32 | 51-29 | 7-3 | W2 |
 | w-Red Sox | 95 | 67 | .586 | 6.0 | 53-28 | 42-39 | 6-4 | L2 |
 | Blue Jays | 86 | 76 | .531 | 15.0 | 41-40 | 45-36 | 7-3 | W2 |
 | Orioles | 71 | 91 | .438 | 30.0 | 40-40 | 31-51 | 3-7 | L3 |
 | Devil Rays | 63 | 99 | .389 | 38.0 | 36-45 | 27-54 | 3-7 | W2 |
AL West
| TEAM | W | L | PCT | GB | HOME | ROAD | L10 | STRK | |
|---|---|---|---|---|---|---|---|---|---|
 | y-Athletics | 96 | 66 | .593 | 0.0 | 57-24 | 39-42 | 5-5 | L3 |
 | Mariners | 93 | 69 | .574 | 3.0 | 50-31 | 43-38 | 6-4 | W3 |
 | Angels | 77 | 85 | .475 | 19.0 | 45-37 | 32-48 | 5-5 | W1 |
 | Rangers | 71 | 91 | .438 | 25.0 | 43-38 | 28-53 | 4-6 | L1 |
NL West
| TEAM | W | L | PCT | GB | HOME | ROAD | L10 | STRK | |
|---|---|---|---|---|---|---|---|---|---|
 | y-Giants | 100 | 61 | .621 | 0.0 | 57-24 | 43-37 | 7-3 | W1 |
 | Dodgers | 85 | 77 | .525 | 15.5 | 46-35 | 39-42 | 4-6 | L1 |
 | Diamondbacks | 84 | 78 | .519 | 16.5 | 45-36 | 39-42 | 5-5 | L2 |
 | Rockies | 74 | 88 | .457 | 26.5 | 49-32 | 25-56 | 5-5 | W2 |
 | Padres | 64 | 98 | .395 | 36.5 | 35-46 | 29-52 | 4-6 | L2 |
y - clinched division
w - clinched wild card
x - clinched playoff berth
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