This is a list of films which have placed number one at the weekend box office in Japan during 2005.
| † | This implies the highest-grossing movie of the year. [1] [ better source needed ] |
| # | Weekend End Date | Film | Total Weekend Gross | Notes |
|---|---|---|---|---|
| 1 | January 2, 2005 | Howl's Moving Castle † | $17,796,006 | |
| 2 | January 9, 2005 | $14,451,460 | ||
| 3 | January 16, 2005 | $12,109,245 | ||
| 4 | January 23, 2005 | Ocean's Twelve | $16,631,674 | |
| 5 | January 30, 2005 | $16,095,212 | ||
| 6 | February 6, 2005 | The Phantom of the Opera | $14,504,003 | |
| 7 | February 13, 2005 | The Bourne Supremacy | $14,063,154 | |
| 8 | February 20, 2005 | $9,279,190 | ||
| 9 | February 27, 2005 | The Phantom of the Opera | $8,946,676 | |
| 10 | March 6, 2005 | Shark Tale | $10,918,797 | |
| 11 | March 13, 2005 | Rockman EXE & Duel Masters | $12,708,498 | |
| 12 | March 20, 2005 | National Treasure | $11,666,763 | |
| 13 | March 27, 2005 | $9,488,042 | ||
| 14 | April 3, 2005 | $8,686,572 | ||
| 15 | April 10, 2005 | Detective Conan: Strategy Above the Depths | $7,384,173 | |
| 16 | April 17, 2005 | Constantine | $14,859,234 | |
| 17 | April 24, 2005 | $12,565,553 | ||
| 18 | May 1, 2005 | $13,499,378 | ||
| 19 | May 8, 2005 | Koshonin Mashita Masayoshi | $13,575,874 | |
| 20 | May 15, 2005 | $11,052,795 | ||
| 21 | May 22, 2005 | $9,755,250 | ||
| 22 | May 29, 2005 | $9,006,342 | ||
| 23 | June 5, 2005 | The Forgotten | $1,339,280 | |
| 24 | June 12, 2005 | Sengoku Jieitai 1549 | $13,225,26 | |
| 25 | June 19, 2005 | Batman Begins | $11,575,136 | |
| 26 | June 26, 2005 | War of the Worlds | $20,191,820 | |
| 27 | July 3, 2005 | Star Wars: Episode III – Revenge of the Sith | $32,216,158 | |
| 28 | July 10, 2005 | $16,028,098 | ||
| 29 | July 17, 2005 | $11,356,792 | ||
| 30 | July 24, 2005 | $14,226,192 | ||
| 31 | July 31, 2005 | $9,719,118 | ||
| 32 | August 7, 2005 | $16,064,791 | ||
| 33 | August 14, 2005 | Madagascar | $11,568,323 | |
| 34 | August 21, 2005 | $9,199,454 | ||
| 35 | August 28, 2005 | The Suspect Muroi Shinji | $9,213,992 | |
| 36 | September 4, 2005 | Charlie and the Chocolate Factory | $21,218,964 | |
| 37 | September 11, 2005 | $15,344,119 | ||
| 38 | September 18, 2005 | $15,344,119 | ||
| 39 | September 25, 2005 | $11,590,356 | ||
| 40 | October 2, 2005 | $10,774,600 | ||
| 41 | October 9, 2005 | Stealth | $2,134,210 | |
| 42 | October 16, 2005 | Charlie and the Chocolate Factory | $7,929,885 | |
| 43 | October 23, 2005 | Corpse Bride | $6,913,660 | |
| 44 | October 30, 2005 | A Moment to Remember | $9,485,907 | |
| 45 | November 6, 2005 | The Brothers Grimm | $10,534,554 | |
| 46 | November 13, 2005 | Always Sanchōme no Yūhi | $8,158,913 | |
| 47 | November 20, 2005 | $5,816,461 | ||
| 48 | November 27, 2005 | Harry Potter and the Goblet of Fire | $15,677,146 | |
| 49 | December 4, 2005 | $16,548,704 | ||
| 50 | December 11, 2005 | $16,842,314 | ||
| 51 | December 18, 2005 | $12,568,150 | ||
| 52 | December 25, 2005 | $16,755,802 |