| Sacajawea Bluegrass Festival | Pasco | WA | United States | June | Bluegrass |
| Salmon Lake Park Bluegrass ‘Classic Fun Pick’ Weekend | Grapeland | TX | United States | May | Bluegrass |
| Salmon Lake Park Bluegrass Festival | Grapeland | TX | United States | October | Bluegrass |
| Salmonfest Alaska | Ninilchik | AK | United States | August | Jam |
| SamJam Bluegrass Festival | Piketon | OH | United States | September | Bluegrass |
| San Jose Jazz Festival | San Jose | CA | United States | August | Jazz |
| Sandy Lee Watkins Songwriters Festival | Henderson | KY | United States | July | Singer-songwriter, Americana, with a focus on the stories behind the songs |
| Santa Barbara Old-Time Fiddler’s Festival | Goleta | CA | United States | October | Bluegrass |
| Santa Cruz Mountain Sol Festival | Felton | CA | United States | August | Americana, Roots, Rock, Reggae, and more. |
| Santa Fe TradFest | Santa Fe | NM | United States | August | Bluegrass |
| Seabreeze Jazz Festival | Panama City Beach | FL | United States | April | Jazz |
| Secret Dreams Festival | Thornville | OH | United States | July | Jam |
| SEMBA May Bluegrass Festival | Houston | MN | United States | May | Bluegrass |
| SEMBA Summer Bluegrass Festival | Houston | MN | United States | August | Bluegrass |
| Sertoma Spring Bluegrass Festival | Brooksville | FL | United States | March | Bluegrass |
| Shakori Hills GrassRoots Festival | Pittsboro | NC | United States | October | Bluegrass |
| Shaky Boots Festival | Atlanta | GA | United States | April | Country, Americana, rock, with a diverse lineup of artists across various genres |
| Shoe Fest | Manteno | IL | United States | September | Variety |
| Shorty’s Strickly Bluegrass Festival | East Peoria | IL | United States | March | Bluegrass |
| Siesta Valley Strings & Things Music Festival | Berkeley | CA | United States | June | Bluegrass, with elements of Americana, Folk, and Roots music. |
| Silver Dollar City Bluegrass and BBQ Festival | Branson | MO | United States | Multiple Months | Bluegrass |
| Sisters Folk Festival | Sisters | OR | United States | September | Folk |
| SkinnyFest Bluegrass Festival | West Union | OH | United States | September | Bluegrass |
| Smithville Fiddlers’ Jamboree | Smithville | TN | United States | July | Bluegrass |
| Smoked Country Jam BG Music Festival | Cross Fork | PA | United States | June | Bluegrass |
| Smokey Mountains Bluegrass Festival | Waynesville | NC | United States | October | Bluegrass |
| Smoky Mountain Bluegrass Festival | Maggie Valley | NC | United States | October | Bluegrass |
| Snowgrass Music Festival | Estes Park | CO | United States | July | Bluegrass |
| Sol Grass Music Festival | Washington Island | WI | United States | June | Bluegrass |
| Songwriters in Paradise | Napa | FL | United States | July | Singer-songwriter, Americana, Folk |
| Soundside Festival | Bridgeport | CT | United States | September | Folk, Pop, Rock |
| South Branch Valley Bluegrass Festival | Romney | WV | United States | June | Bluegrass |
| South By Southwest (SXSW) | Multiple | TX | United States | March | Alternative, Electronic, Hip Hop, Indie, Rock |
| South Carolina State Bluegrass Festival | Myrtle Beach | SC | United States | May | Bluegrass |
| South Florida Folk Festival | Fort Lauderdale | FL | United States | February | Folk, Acoustic, Singer-songwriter |
| South Park Bluegrass Festival | Alma | CO | United States | July | Bluegrass |
| South Sound Block Party | Olympia | WA | United States | August | Indie |
| South Star | Huntsville | AL | United States | September | Alternative, Hip Hop, Pop, Rock |
| South State 48 | Carlsbad | CA | United States | November | Bluegrass |
| Southland Bluegrass Music Festival | Immokalee | FL | United States | April | Bluegrass |
| SPBGMA Music Awards & National Convention | Nashville | TN | United States | January | Bluegrass |
| Spirit in the Bluegrass | Lexington | KY | United States | June | Bluegrass |
| Spring Hookahville | Newark | OH | United States | June | Bluegrass |
| SpringFree Bluegrass Festival | Vail Village | CO | United States | May | Bluegrass |
| Spruce Pine BBQ & Bluegrass | Spruce Pine | NC | United States | October | Bluegrass |
| Square Roots Festival | Chicago | IL | United States | July | Variety |
| St. Augustine Songwriters Festival | St. Augustine | FL | United States | September | Singer/songwriting |
| Stagecoach Festival | Indio | CA | United States | April | Country music, with some Americana and roots influences |
| Stapleton Bluegrass Festival | Stapleton | AL | United States | October | Bluegrass |
| Starvy Creek Bluegrass Festival | Conway | MO | United States | July | Bluegrass |
| Starvy Creek Bluegrass Festival | Conway | MO | United States | September | Bluegrass |
| Steve Sutton Fest | Black Mountain | NC | United States | June | Bluegrass |
| Strawberry Music Festival | Grass Valley | CA | United States | May | Americana, folk, bluegrass, and roots music |
| Strawberry Music Festival | Tuolumne | CA | United States | May | Bluegrass |
| Stringbean Memorial Bluegrass Festival | Tyner | KY | United States | June | Bluegrass |
| Sugar Maple Traditional Music Festival | Madison | WI | United States | August | Bluegrass |
| Sultana Downrigging Tall Ship and Bluegrass Festival | Chestertown | MD | United States | November | Bluegrass |
| Summer String Summit | Kissimmee | FL | United States | June | Americana, Roots Music, Jam Bands, Bluegrass, Folk |
| Summerfest | Milwaukee | WI | United States | June | Americana, roots, rock, pop, country, and various other genres, featuring singer-songwriter artists on multiple stages. This massive festival offers a chance to experience Americana alongside a wide range of musical styles. |
| Summerfest | Milwaukee | WI | United States | July | Americana, roots, rock, pop, country, and various other genres, featuring singer-songwriter artists on multiple stages. This massive festival offers a chance to experience Americana alongside a wide range of musical styles. |
| Summertown Bluegrass Reunion | Summertown | TN | United States | August | Bluegrass |
| Sun Valley Music Festival | Alexandria | KY | United States | July | Bluegrass |
| Susanville Bluegrass Festival | Susanville | CA | United States | June | Bluegrass |
| Sustain Art and Music Festival | French Lick | IN | United States | June | Music and Art |
| Suwanee Spring Reunion | Live Oak | FL | United States | March | Americana, Roots Music, Jam Bands, Bluegrass, Folk |
| Suwannee Roots Revival | Live Oak | FL | United States | October | Americana, Roots Music, Jam Bands, Bluegrass, Folk |
| Swampland Music Festival | Live Oak | LA | United States | July | Americana, Roots, Singer-Songwriter, with influences of Blues, Country, and Folk. |
| Sweet Pea Festival | Bozeman | MT | United States | August | Bluegrass, Jam, Rock |
