| That Is Why | |
| Cover: | Jellyfish - That Is Why.jpg |
| Type: | single |
| Artist: | Jellyfish |
| Album: | Bellybutton |
| B-Side: | Calling Sarah |
| Label: | Charisma |
| Prev Title: | The King Is Half-Undressed |
| Prev Year: | 1990 |
| Next Title: | Baby's Coming Back |
| Next Year: | 1990 |
"That Is Why" is a song by the American power pop group Jellyfish. It is the second single released in support of their 1990 debut album Bellybutton.
All songs written by Roger Manning and Andy Sturmer