| Heart | |
| Type: | single |
| Artist: | Do As Infinity |
| Album: | Break of Dawn |
| Released: | December 8, 1999 |
| Genre: | J-Pop |
| Length: | 41:03 |
| Label: | avex trax |
| Producer: | Dai Nagao |
| Prev Title: | Tangerine Dream |
| Prev Year: | 1999 |
| Next Title: | Oasis |
| Next Year: | 2000 |
"Heart" is Do As Infinity's second single, and the first of four singles with remixes, released in 1999.
This song was included in the band's compilation albums Do the Best and Do the A-side.