| Abbreviation | Definition |
|---|---|
| KMBA | Kitchener Minor Baseball Association |
| KPB | Kempsville PONY Baseball |
| KRB | Killeen Rebels Baseball |
| KWB | Kevin Wilson Baseball |
| L | Line Out |
| L | Loss |
| L | Losses |
| LAD | Los Angeles Dodgers |
| LBA | Lakeville Baseball Association |
| LBA | Lewisboro Baseball Association |
| LBA | Lewisville Baseball Association |
| LBBA | Lake Bluff Baseball Association (Lake Bluff, Illinois) |
| LBBA | Longview Boys Baseball Association (Longview, Texas) |
| LBCA | LA Baseball Coaches Association |
| LBCA | Louisiana Baseball Coaches Association |
| LBL | Longmont Baseball League |
| LBPPR | Puerto Rican Professional Baseball League |
| LCB | Lakeland City Baseball |
| LFGM | Let's F***ing Go Mets |
| LGFM | Let’s F***ing Go Mets |