| Competition: | I Lyga |
| Season: | 2015 |
| Winners: | Lietava |
| League Topscorer: | Laurynas Stonkus |
| Biggest Home Win: | Žalgiris B 12–0 Tauras |
| Biggest Away Win: | Tauras 2–8 Šilutė |
| Highest Scoring: | Žalgiris B 12–0 Tauras |
| Prevseason: | 2014 |
| Nextseason: | 2016 |
2015 LFF I Lyga was a Lithuanian second-tier football league season which started on March 28, 2015 and finished on October 31. It consisted of 18 teams.
| Team | Home city | Home ground | |
|---|---|---|---|
| Lietava | Jonava City stadium | ||
| Žalgiris B | LFF Stadium | ||
| Palanga | Palanga City stadium | ||
| Banga | Gargždai City stadium | ||
| Trakai-2 | Trakai City stadium | ||
| Šilas | FK "Šilas" stadium | ||
| Panevėžys | Aukštaitija Stadium | ||
| Nevėžis | Kėdainiai City stadium | ||
| Šilutė | Šilutė City stadium | ||
| FBK Kaunas | Darius and Girėnas Stadium | ||
| Lokomotyvas | Radviliškis City stadium | ||
| Džiugas | Telšiai City stadium | ||
| Kelmė City stadium | |||
| Auska | Alytus City stadium | ||
| Minija | Kretinga City stadium | ||
| MRU | LFF Stadium | ||
| Tauras | Tauragė City stadium | ||
| Kruoja-2 | Pakruojis City stadium |