| Ladies of Bluegrass Music Festival | Green Bay | WI | United States | April | Bluegrass |
| Lake Cumberland Bluegrass Festival | Russell Springs | KY | United States | August | Bluegrass |
| Lake Itasca Family Music Festival | Lake Itasca | MN | United States | August | Family-friendly music |
| Lake Martin Songwriter Festival | Alexander City | AL | United States | September | Singer-Songwriter, Americana, Folk and Country |
| Lake Tahoe Reggae Festival | Lake Tahoe | CA | United States | August | Reggae |
| Lakefront Music Fest | Prior Lake | MN | United States | July | Variety |
| Larryfest | LaFarge | WI | United States | August | Bluegrass |
| Laurel Hill Bluegrass Festival | Somerset | PA | United States | August | Bluegrass |
| Levitate Festival | Marshfield | MA | United States | July | Jam |
| Lewis County Bluegrass Festival | Crawford | WV | United States | August | Bluegrass |
| Little Roy & Lizzy Music Festival | Lincolnton | GA | United States | May | Bluegrass |
| Locomotion Fest | Felton | CA | United States | August | Jam, Bluegrass |
| Lone Cedar Acres Bluegrass Festival | Pittsville | MD | United States | October | Bluegrass |
| Lone Star Smokeout | Arlington | TX | United States | May | Country |
| Long Beach Jazz Festival | Long Beach | CA | United States | August | Jazz |
| Lost in Dreams Festival | Los Angeles | CA | United States | July | Variety |
| Lost Lands | Legend Valley | OH | United States | September | Bass, Electronic |
| Lost River Bluegrass Festival | Merrill | OR | United States | July | Bluegrass |
| Louisiana Folk Roots Festival | Natchitoches | LA | United States | September | Folk, Americana, Roots, with a focus on Louisiana music traditions. |
| Love RNB Festival | Los Angeles | CA | United States | September | R&B |
| Lovegrass Music Festival | Wilson Lake | KS | United States | August | Bluegrass |
| Lucidity Festival | Bradley | CA | United States | April | Alternative, Electronic, Rock |
