This is a list of films which have placed number one at the weekend box office in Canada during 2003.
| Weekend End Date | Film | Weekend Gross (millions) | Notes | ||
|---|---|---|---|---|---|
| 1 | $3.84 | ||||
| 2 | The Lord of the Rings: The Two Towers | $2.50 | Just Married was #1 in America. | ||
| 3 | The Lord of the Rings: The Two Towers | $1.80 | Kangaroo Jack was #1 in America. | ||
| 4 | The Lord of the Rings: The Two Towers | $1.08 | Darkness Falls was #1 in America. | ||
| 5 | The Recruit | $1.43 | |||
| 6 | How to Lose a Guy in 10 Days | $2.86 | |||
| 7 | Daredevil | $3.17 | |||
| 8 | Daredevil | $1.33 | |||
| 9 | Cradle 2 the Grave | $1.28 | |||
| 10 | Tears of the Sun | $1.61 | Bringing Down the House was #1 in America. | ||
| 11 | Agent Cody Banks | $1.52 | Bringing Down the House was #1 in America. | ||
| 12 | Dreamcatcher | $1.29 | Bringing Down the House was #1 in America. | ||
| 13 | Basic | $1.24 | Head of State was #1 in America. | ||
| 14 | Phone Booth | $1.69 | |||
| 15 | Anger Management | $3.44 | |||
| 16 | Anger Management | $2.60 | |||
| 17 | Anger Management | $1.52 | Identity was #1 in America. | ||
| 18 | X2: X-Men United | $7.82 | |||
| 19 | X2: X-Men United | $3.60 | |||
| 20 | The Matrix Reloaded | $8.83 | The Matrix Reloaded had the highest weekend debut of 2003. | ||
| 21 | Bruce Almighty | $4.92 | |||
| 22 | Finding Nemo | $3.72 | |||
| 23 | 2 Fast 2 Furious | $3.53 | |||
| 24 | Finding Nemo | $2.12 | Finding Nemo reclaimed #1 in its third weekend of release. | ||
| 25 | Hulk | $4.01 | |||
| 26 | $3.59 | ||||
| 27 | $3.61 | ||||
| 28 | $3.66 | ||||
| 29 | Bad Boys II | $2.65 | |||
| 30 | $2.29 | was #1 in America. | |||
| 31 | American Wedding | $3.11 | |||
| 32 | S.W.A.T. | $3.11 | |||
| 33 | S.W.A.T. | $1.48 | Freddy vs. Jason was #1 in America. | ||
| 34 | S.W.A.T. | $1.17 | Freddy vs. Jason was #1 in America. | ||
| 35 | S.W.A.T. | $1.16 | Jeepers Creepers 2 was #1 in America. | ||
| 36 | Pirates of the Caribbean: The Curse of the Black Pearl | $0.68 | Pirates of the Caribbean: The Curse of the Black Pearl reclaimed #1 in its ninth weekend of release. was #1 in America. | ||
| 37 | Once Upon a Time in Mexico | $2.25 | |||
| 38 | Underworld | $2.10 | |||
| 39 | The Rundown | $1.65 | |||
| 40 | School of Rock | $1.50 | |||
| 41 | $2.24 | ||||
| 42 | The Texas Chainsaw Massacre | $1.62 | |||
| 43 | Scary Movie 3 | $3.66 | |||
| 44 | Scary Movie 3 | $1.65 | |||
| 45 | The Matrix Revolutions | $5.83 | |||
| 46 | $2.07 | Elf was #1 in America. | |||
| 47 | The Cat in the Hat | $2.68 | |||
| 48 | The Cat in the Hat | $1.59 | |||
| 49 | The Last Samurai | $2.54 | |||
| 50 | The Last Samurai | $1.55 | Something's Gotta Give was #1 in America. | ||
| 51 | $8.41 | ||||
| 52 | The Lord of the Rings: The Return of the King | $6.80 |
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