| Competition: | LFF Lyga |
| Winners: | KSS Klaipėda |
| Matches: | 21 |
| Total Goals: | 91 |
| Longest Unbeaten: | KSS Klaipėda (6 games) |
| Longest Losses: | Tauras Kaunas (6 games) |
| Prevseason: | 1930 |
| Nextseason: | 1932 |
| Season: | 1931 |
The 1931 LFF Lyga was the 10th season of the LFF Lyga football competition in Lithuania. It was contested by 7 teams, and KSS Klaipėda won the championship.