The guests
Cameos
Former houseguests and other franchise figures who appeared during Big Brother 15.
| Guest | When | Appearance |
|---|---|---|
| Britney | Week 2, aired Wed Jul 10, 2013 | Appeared by video to introduce the baby-themed Power of Veto competition. |
| Zingbot | Week 9, aired Wed Aug 28, 2013 | Returned to the house to roast the houseguests. |
| Dan | Week 9, aired Thu Aug 29, 2013 | Discussed the season in an interview with Julie Chen. |
| Rachel | Week 9, aired Thu Aug 29, 2013 | Appeared with Brendon in the broadcast's update on former houseguest couples. |
| Brendon | Week 9, aired Thu Aug 29, 2013 | Appeared with Rachel in the broadcast's update on former houseguest couples. |
| Dani | Week 9, aired Thu Aug 29, 2013 | Appeared with Dominic in the broadcast's update on former houseguest couples. |
| Dominic | Week 9, aired Thu Aug 29, 2013 | Appeared with Dani in the broadcast's update on former houseguest couples. |
| Jeff | Week 9, aired Thu Aug 29, 2013 | Appeared with Jordan in the broadcast's update on former houseguest couples. |
| Jordan | Week 9, aired Thu Aug 29, 2013 | Appeared with Jeff in the broadcast's update on former houseguest couples. |
| Ian | Week 11, aired Wed Sep 11, 2013 | Hosted the Power of Veto competition. |
| Dr. Will | Week 12, aired Wed Sep 18, 2013 | Moderated the jury discussion shown in the finale. |