| Cai Tongtong | |
| Fullname: | Cai Tongtong |
| Birth Date: | 7 February 1990 |
| Birth Place: | Wenzhou, Zhejiang |
| Discipline: | RG |
| Show-Medals: | yes |
Cai Tongtong (; born February 7, 1990, in Wenzhou, Zhejiang) is a Chinese rhythmic gymnast. She won the group championships at the 2006 National Group Championships.
She represented China at the 2008 Summer Olympics and won a silver medal in the group competition.