| One Day | |
| Border: | yes |
| Type: | single |
| Artist: | Arash featuring Helena |
| Album: | Superman |
| Released: | 12 March 2014 |
| Length: | 3:30 |
| Label: | Extensive Music |
| Prev Title: | She Makes Me Go |
| Prev Year: | 2014 |
| Next Title: | Sex Love Rock n Roll (SLR) |
| Next Year: | 2014 |
"One Day" is a single by Iranian–Swedish singer Arash featuring Swedish singer Helena. The song was released on 12 March 2014.