| One | 7:24 | |
| Breadfan | 5:43 | |
| For Whom The Bell Tolls (Live) | 4:48 | |
| Welcome Home (Sanitarium) (Live) | 6:06 | |
| One (Demo Version) | 7:04 |
| Title, Format | Label | Cat# | Country | Year | |
|---|---|---|---|---|---|
| One (CD, MiniAlbum) | CBS/Sony | 23DP 5438 | Japan | 1989 | |
| One (10", Pic) | Vertigo | METPD 510 | UK | 1988 | |
| One (7") | Elektra | 7-69329 | US | 1988 | |
| One (CD, Promo) | Elektra, Asylum Records | PR 8044-2 | US | 1988 | |
| One (CD, Single, Mini) | Elektra | 69329-2 | US | 1988 | |
| One (Cass, Single) | Elektra | 9 69329-4 | US | 1988 | |
| One (Cass, Single) | Elektra | 9 4-69329 | US | 1988 | |
| One (12") | Vertigo | 874 067-1 | Europe | 1989 | |
| One (12") | Vertigo | METAL 512 | UK | 1989 | |
| One (12", Ltd) | Vertigo, Vertigo | METG 512, 874 095-1 | UK | 1989 | |
| One (7") | Vertigo, Vertigo | METAL 5, 874 006-7 | UK | 1989 | |
| One (CD, Maxi) | Vertigo | 874 155-2 | Germany | 1989 | |
| One (CD, Maxi) | Vertigo, Vertigo | METCD 5, 874 067-2 | UK | 1989 | |
| One (CD, MiniAlbum, Ltd) | CBS/Sony | 23DP 5438 | Japan | 1989 | |
| One (CD) | Elektra | 65920-2 | US | 1993 | |
| We Are The Champions (CD, Single) | Hollywood Records | HR-65925-2 | US | 1993 | |
| One (12", Ltd, Pic) | Vertigo | 858 547-1 | UK | 1994 | |
| One (CD, Maxi) | Vertigo | 858 545-2 | UK | 1994 | |
| One (CD, Maxi, Gol) | Vertigo | 858 545-2 | Australasia | 1994 | |
| One (CD, Single) | Vertigo | 858 544-2 | Germany | 1994 |