According to Sony Music Japan, DEFINITELY MAYBE by OASIS has sold 5,000,000 copies worldwide. The album sold best in United Kingdom (2,400,000 copies), United States (1,000,000 copies) and Japan (250,000 copies).
DEFINITELY MAYBE certifications and sales
| Country / region | Sales | Certification / source | Certification date / sales as of | |
 Australia |
70,000 | 1x Platinum | DECEMBER 1996 |
Australia Sales: 70,000
Certification / note: 1x Platinum
Certification Date / sales as of: DECEMBER 1996
|
 Canada |
100,000 | 1x Platinum | 1997 |
Canada Sales: 100,000
Certification / note: 1x Platinum
Certification Date / sales as of: 1997
|
 France |
200,000 | 2x Gold | 1998 |
France Sales: 200,000
Certification / note: 2x Gold
Certification Date / sales as of: 1998
|
 Italy |
25,000 | 1x Gold (Sales since 2009) | 2020 |
Italy Sales: 25,000
Certification / note: 1x Gold (Sales since 2009)
Certification Date / sales as of: 2020
|
 Japan |
250,000 | 1x Platinum | July 2005 |
Japan Sales: 250,000
Certification / note: 1x Platinum
Certification Date / sales as of: July 2005
|
 New Zealand |
15,000 | 1x Platinum |
New Zealand Sales: 15,000
Certification / note: 1x Platinum
Certification Date / sales as of:
|
|
 Sweden |
50,000 | 1x Gold | 17 July, 1996 |
Sweden Sales: 50,000
Certification / note: 1x Gold
Certification Date / sales as of: 17 July, 1996
|
 Switzerland |
25,000 | 1x Gold | 1997 |
Switzerland Sales: 25,000
Certification / note: 1x Gold
Certification Date / sales as of: 1997
|
 United Kingdom |
2,400,000 | 8x Platinum | 7 January, 2022 |
United Kingdom Sales: 2,400,000
Certification / note: 8x Platinum
Certification Date / sales as of: 7 January, 2022
|
 United States |
1,000,000 | 1x Platinum | 31 August, 2001 |
United States Sales: 1,000,000
Certification / note: 1x Platinum
Certification Date / sales as of: 31 August, 2001
|
 Europe (IFPI) |
2,000,000 | 2x Platinum | 1996 |
Europe (IFPI) Sales: 2,000,000
Certification / note: 2x Platinum
Certification Date / sales as of: 1996
|
| Worldwide sales | 5,000,000 | Sony Music Japan |
Total
Sales: 5,000,000
Source: Sony Music Japan
|
Year-end chart performance for DEFINITELY MAYBE
| Chart 1994 | Rank | Sales |
 European Albums (Music & Media) |
83 | |
| Swedish Albums (Sverigetopplistan) |
78 | |
| UK Albums |
27 | 380,000 |
| Chart 1995 | Rank | Sales |
 Belgian Albums (Ultratop Wallonia) |
87 | |
| European Albums (Music & Media) |
39 | |
| UK Albums |
22 | 580,000 |
| UK Artist Albums |
17 | |
| Chart 1996 | Rank | Sales |
| European Albums (Music & Media) |
53 | |
| New Zealand Albums (RMNZ) |
47 | |
| UK Albums |
25 | 470,000 |
| UK Artist Albums |
21 | 470,000 |
| Chart 1997 | Rank | Sales |
| UK Albums |
143 | 130,000 |
| Chart 1999 | Rank | Sales |
| UK Albums |
166 | 110,000 |
| Chart 2005 | Rank | Sales |
| UK Artist Albums |
184 | 97,000 |
| Chart 2018 | Rank | Sales |
| UK Albums (Official Charts) |
84 | |
| Chart 2019 | Rank | Sales |
| UK Albums (Official Charts) |
71 | |
| Chart 2020 | Rank | Sales |
| UK Albums (Official Charts) |
67 | |
| Chart 2021 | Rank | Sales |
| UK Albums (Official Charts) |
86 | |
| Chart 2022 | Rank | Sales |
| UK Albums (Official Charts) |
75 |
Decade-end chart performance for DEFINITELY MAYBE
| Chart 2010's | Rank |
| UK Vinyl Albums (OCC) |
13 |