The 2003 United States Open Championship was the 103rd U.S. Open, held June 12–15 at the North Course of Olympia Fields Country Club in Olympia Fields, Illinois, a suburb south of Chicago.

Jim Furyk won his only major championship, three shots ahead of runner-up Stephen Leaney.

This was the fourth major held at Olympia Fields; it hosted the U.S. Open in 1928 and the PGA Championship in 1925 and 1961.

North Course Source:[1] Ernie Els (4,9,10,11,12,13,16), Retief Goosen (9,10,16), Lee Janzen, Corey Pavin, Tiger Woods (3,4,5,8,9,11,12,16) Ricky Barnes (a), Hunter Mahan (a) José María Olazábal (9,10), Vijay Singh (5,9,11,12,16), Mike Weir (11,12,16) David Duval, Paul Lawrie (10,16), Mark O'Meara Rich Beem (9,12,16), David Toms (9,11,16) Davis Love III (9,11,16) Don Pooley Robert Allenby (9,16), Tom Byrum, Nick Faldo, Sergio García (9,10,16), Jay Haas (11,16), Pádraig Harrington (10,13,16), Dudley Hart, Scott Hoch (16), Justin Leonard (9,11,16), Peter Lonard (15,16), Jeff Maggert, Billy Mayfair, Phil Mickelson (9,16), Nick Price (9,16) K. J. Choi (16), Chris DiMarco (16), Bob Estes (16), Fred Funk (16), Jim Furyk (11,16), Charles Howell III (16), Jerry Kelly (16), Steve Lowery, Scott McCarron, Shigeki Maruyama (16), Len Mattiace (16), Rocco Mediate (16), Kenny Perry (11,16), Chris Riley (16), Loren Roberts, John Rollins, Jeff Sluman (16) Thomas Bjørn (16), Ángel Cabrera (16), Michael Campbell (16), Trevor Immelman (16), Stephen Leaney, Colin Montgomerie (16), Eduardo Romero (16), Justin Rose (16), Adam Scott (16) Toru Taniguchi Craig Parry (16) Stuart Appleby, Paul Casey, Darren Clarke, Fred Couples, Niclas Fasth, Brad Faxon, Steve Flesch, Bernhard Langer, Kirk Triplett, Scott Verplank Hale Irwin, Tom Kite, Tom Watson (a) denotes amateur (L) denotes player advanced through local qualifying Thursday, June 12, 2003 Friday, June 13, 2003 Amateurs: Kuehne (+1), Barnes (+2), Holmes (+5), Baryla (+6), Mahan (+6), Haas (+9), List (+9), Reinsberg (+12), Reavie (+13), Glissmeyer (+19).

Saturday, June 14, 2003 Sunday, June 15, 2003 Amateurs: Trip Kuehne (+10), Ricky Barnes (+11)[8] Final round Cumulative tournament scores, relative to par Source:[9]