New or Significantly Altered Models
- 1991 Buick Park Avenue
- 1991 Buick Regal sedan
- 1991 Buick Roadmaster wagon
Updated Models
Mostly Unchanged
- 1991 Buick Century
- 1991 Buick Century coupe
- 1991 Buick Century wagon
- 1991 Buick LeSabre
- 1991 Buick LeSabre sedan
- 1991 Buick Reatta convertible
- 1991 Buick Reatta coupe
- 1991 Buick Riviera
- 1991 Buick Skylark
- 1991 Buick Skylark sedan
Other
- 1991 Buick Roadmaster
Discontinued
- 1990 Buick Electra sedan
- 1990 Buick Estate Wagon