Number-one albums of 1991 (U.S.)
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These are the Billboard magazine number one albums of 1991, per the Billboard 200.
| Issue Date | Album | Artist |
| January 5 | To the Extreme | Vanilla Ice |
| January 12 | To the Extreme | Vanilla Ice |
| January 19 | To the Extreme | Vanilla Ice |
| January 26 | To the Extreme | Vanilla Ice |
| February 2 | To the Extreme | Vanilla Ice |
| February 9 | To the Extreme | Vanilla Ice |
| February 16 | To the Extreme | Vanilla Ice |
| February 23 | To the Extreme | Vanilla Ice |
| March 2 | Mariah Carey | Mariah Carey |
| March 9 | Mariah Carey | Mariah Carey |
| March 16 | Mariah Carey | Mariah Carey |
| March 23 | Mariah Carey | Mariah Carey |
| March 30 | Mariah Carey | Mariah Carey |
| April 6 | Mariah Carey | Mariah Carey |
| April 13 | Mariah Carey | Mariah Carey |
| April 20 | Mariah Carey | Mariah Carey |
| April 27 | Mariah Carey | Mariah Carey |
| May 4 | Mariah Carey | Mariah Carey |
| May 11 | Mariah Carey | Mariah Carey |
| May 18 | Out of Time | R.E.M. |
| May 25 | Time, Love & Tenderness | Michael Bolton |
| June 1 | Out of Time | R.E.M. |
| June 8 | Spellbound | Paula Abdul |
| June 15 | Spellbound | Paula Abdul |
| June 22 | Efil4zaggin | N.W.A. |
| June 29 | Slave to the Grind | Skid Row |
| July 6 | For Unlawful Carnal Knowledge | Van Halen |
| July 13 | For Unlawful Carnal Knowledge | Van Halen |
| July 20 | For Unlawful Carnal Knowledge | Van Halen |
| July 27 | Unforgettable... with Love | Natalie Cole |
| August 3 | Unforgettable... with Love | Natalie Cole |
| August 10 | Unforgettable... with Love | Natalie Cole |
| August 17 | Unforgettable... with Love | Natalie Cole |
| August 24 | Unforgettable... with Love | Natalie Cole |
| August 31 | Metallica | Metallica |
| September 7 | Metallica | Metallica |
| September 14 | Metallica | Metallica |
| September 21 | Metallica | Metallica |
| September 28 | Ropin' the Wind | Garth Brooks |
| October 5 | Use Your Illusion II | Guns N' Roses |
| October 12 | Use Your Illusion II | Guns N' Roses |
| October 19 | Ropin' the Wind | Garth Brooks |
| October 26 | Ropin' the Wind | Garth Brooks |
| November 2 | Ropin' the Wind | Garth Brooks |
| November 9 | Ropin' the Wind | Garth Brooks |
| November 16 | Ropin' the Wind | Garth Brooks |
| November 23 | Ropin' the Wind | Garth Brooks |
| November 30 | Ropin' the Wind | Garth Brooks |
| December 7 | Achtung Baby | U2 |
| December 14 | Dangerous | Michael Jackson |
| December 21 | Dangerous | Michael Jackson |
| December 28 | Dangerous | Michael Jackson |
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1940 | 1941 | 1942 | 1943 | 1944 | 1945 | 1946 | 1947 | 1948 | 1949 |
