| Womanizer | 3:43 | ||
| Circus | 3:12 | ||
| Out From Under | 3:54 | ||
| Kill The Lights | 3:59 | ||
| Shattered Glass | 2:53 | ||
| If U Seek Amy | 3:37 | ||
| Unusual You | 4:23 | ||
| Blur | 3:09 | ||
| Mmm Papi | 3:22 | ||
| Mannequin | 4:06 | ||
| Lace And Leather | 2:43 | ||
| My Baby | 3:20 | ||
| Radar | 3:49 |
| Title | Label | Cat# | Country | Year | |
|---|---|---|---|---|---|
| Circus (CD, Album) | Jive | 88697-40387-2 | US | 2008 | |
| Circus (CD, Album) | Jive | 88697403872 | Europe | 2008 | |
| Circus (CD, Album) | Jive | 4988017666876 | Japan | 2008 | |
| Circus (CD, Album) | Jive | 88697-42504-2 | Russia | 2008 | |
| Circus (CD, Album) | Jive | 88697403872 | Australia | 2008 | |
| Circus (CD, Album) | Jive | 886974038726 | Europe | 2008 | |
| Circus (CD, Album) | Jive | 88697406982 | UK | 2008 | |
| Circus (CD, Album, Del + DVD, NTSC) | Jive | 88697-40776-2 | Taiwan | 2008 | |
| Circus (CD, Album, Del + DVD, NTSC) | Jive | 88697-40776-2 | US | 2008 | |
| Circus (CD, Album, Del + DVD-V, NTSC) | Jive | 88697407762 | Europe | 2008 | |
| Circus (CD, Album, Del + DVD-V, NTSC) | Jive | 88697407752 | UK | 2008 | |
| Circus (CDr, MiniAlbum, Promo) | Jive | none | Japan | 2008 | |
| Circus (CD, Album, Car) | Jive | 88697480672 | Europe | 2009 | |
| Circus (CD, Album, Dig) | Jive | 88697-53966-2 | Europe | 2009 | |
| Circus (CD, Album, Eco) | Sony Music Entertainment | 65415443 | Poland | 2009 |