These are the Oricon number one albums of 1999, per the Oricon Albums Chart.
| Indicates best-selling album of 1999 |
| Issue Date | Album | Artist(s) | Sales | |
|---|---|---|---|---|
| January 11 | A Song for ×× | 548,210 | ||
| January 18 | 169,570 | |||
| January 25 | People Of The World | 503,610 | ||
| February 1 | A Song for ×× | Ayumi Hamasaki | 103,800 | |
| February 8 | 86,320 | |||
| February 15 | Discovery | 1,110,370 | ||
| February 22 | Kahala Compilation | 424,030 | ||
| March 1 | Eien | 613,130 | ||
| March 8 | H | 248,620 | ||
| March 15 | 120,890 | |||
| March 22 | bgcolor=#FFFF99 style="text-align: center;" rowspan="2" | First Love | 2,026,870 | |
| March 29 | 717,610 | |||
| April 5 | SA | 1,058,510 | ||
| April 12 | Every Best Single +3 | 1,007,670 | ||
| April 19 | bgcolor=#FFFF99 style="text-align: center;" rowspan="2" | First Love | Hikaru Utada | 428,520 |
| April 26 | 222,230 | |||
| May 3 | The Monster | 571,610 | ||
| May 10 | Hide Tribute Spirits | Various Artists | 384,180 | |
| May 17 | bgcolor=#FFFF99 style="text-align: center;" rowspan="2" | First Love | Hikaru Utada | 298,360 |
| May 24 | 258,780 | |||
| May 31 | ID | 513,210 | ||
| June 7 | Zard Best the Single Collection: Kiseki | Zard | 1,307,020 | |
| June 14 | 766,120 | |||
| June 21 | 298,330 | |||
| June 28 | 184,650 | |||
| July 5 | Greatest Hits 1990-1999 | 513,810 | ||
| July 12 | Ark | L'Arc-en-Ciel | 1,533,110 | |
| July 19 | 293,190 | |||
| July 26 | Brotherhood | 1,019,270 | ||
| August 2 | 804,190 | |||
| August 9 | 319,730 | |||
| August 16 | C Album | 451,230 | ||
| August 23 | 138,180 | |||
| August 30 | "Lucky" 20th Century, Coming Century To Be Continued... | 152,370 | ||
| September 6 | No Doubt | 152,030 | ||
| September 13 | Golden Best | 109,240 | ||
| September 20 | 1/42 | Mr. Children | 411,080 | |
| September 27 | Zard Best: Requested Memorial | Zard | 902,420 | |
| October 4 | Cruise Record 1995-2000 | 1,664,330 | ||
| October 11 | Maximum Collection | 456,070 | ||
| October 18 | Cruise Record 1995-2000 | Globe | 183,820 | |
| October 25 | Yuzuen | 506,370 | ||
| November 1 | Heavy Gauge | 1,569,290 | ||
| November 8 | 305,390 | |||
| November 15 | Colorado | Tina | 151,330 | |
| November 22 | Loveppears | Ayumi Hamasaki | 1,201,870 | |
| November 29 | 241,620 | |||
| December 6 | 178,600 | |||
| December 13 | The Very Best | 134,830 | ||
| December 20 | Magnum Collection 1999 "Dear" | 373,790 | ||
| December 27 | Recycle: Greatest Hits of Spitz | 578,630 | ||