| Official |
|---|
| 1.1 | Happiness | 5:16 | Elliott Smith | Happiness | Elliott Smith | Single | | DreamWorks Records | 459 037-2 |
| 1.1 | Happiness | 5:16 | Elliott Smith | Happiness | Elliott Smith | Single | | Cavity Search | CSR-40 |
| 1.1 | Happiness | 5:17 | Elliott Smith | Happiness | Elliott Smith | Single | | DreamWorks Records | 0044-59037-2 |
| 1.14 | Happiness (single version) | 5:15 | Elliott Smith | An Introduction to Elliott Smith | Elliott Smith | Album + Compilation | | Kill Rock Stars | |
| 1.14 | Happiness (single version) | 5:15 | Elliott Smith | An Introduction to… Elliott Smith | Elliott Smith | Album + Compilation | | Domino | WIGCD265 |
| 1.14 | Happiness (single version) | 5:15 | Elliott Smith | An Introduction to Elliott Smith | Elliott Smith | Album + Compilation | | Kill Rock Stars | |
| 1.14 | Happiness (single version) | 5:15 | Elliott Smith | An Introduction to… Elliott Smith | Elliott Smith | Album + Compilation | | Kill Rock Stars | KRS541 |
| 1.19 | Happiness | 5:15 | Elliott Smith | Heaven Adores You Soundtrack | Elliott Smith | Album + Compilation + Soundtrack | | UMe | B0024178-02 |
| 1.19 | Happiness (single version) | 5:15 | Elliott Smith | Heaven Adores You Soundtrack | Elliott Smith | Album + Compilation + Soundtrack | | UMe | |
| 1.19 | Happiness | 5:15 | Elliott Smith | Heaven Adores You Soundtrack | Elliott Smith | Album + Compilation + Soundtrack | | UMe | 602547624277 |