| Back 40 Bluegrass Festival | Curryville | MO | United States | May | Bluegrass |
| Back 40 Memorial Weekend BG Festival | Curryville | MO | United States | June | Bluegrass |
| Back Home Arts & Music Festival | New Martinsville | WV | United States | June | Bluegrass |
| Back to Bluegrass | McGrath | AK | United States | July | Bluegrass |
| Backbone Bluegrass Festival | Strawberry Point | IA | United States | July | Bluegrass |
| Balsam Range Art of Music Festival | Lake Junaluska | NC | United States | December | Bluegrass |
| Bannock County Bluegrass Festival | Inkom | ID | United States | August | Bluegrass |
| Barbecue & Bluegrass Festival | Huntsville | AL | United States | October | Bluegrass |
| Bash on the Bay | Put-In-Bay | OH | United States | August | Country |
| Basilica Block Party | Minneapolis | MN | United States | August | Indie Rock, Folk, Pop, Electronic, and Other Genres |
| Basin Bluegrass Festival | Brandon | VT | United States | July | Bluegrass |
| Bass Canyon | George | WA | United States | August | Bass, Electronic |
| Baton Rouge Blues Festival | Baton Rogue | LA | United States | April | Blues |
| Bayfront Blues Festival | Duluth | MN | United States | August | Blues |
| Baygrass Bluegrass and Craft Beer Festival | Islamorada | FL | United States | January | Bluegrass, with a focus on craft beer pairings |
| Bean Blossom Bluegrass & Uncle Pen Festival | Bean Blossom | IN | United States | June | Bluegrass |
| Bean Blossom Bluegrass & Uncle Pen Festival | Morgantown | IN | United States | September | Bluegrass |
| Beanstalk Music Festival | Bond | CO | United States | August | Jam, Rock |
| Bear Legacy Bluegrass Festival | Havre de Grace | MD | United States | July | Bluegrass |
| Bear on the Square Mountain Festival | Dahlonega | GA | United States | April | Bluegrass |
| Bearsville Bluegrass Festival | Woodstock | NY | United States | May | Bluegrass |
| Beaver Island Music Festival | Beaver Island | MI | United States | July | Americana, Rock |
| Bellingham Exit | Bellingham | WA | United States | October | Bluegrass, Hip Hop, Indie |
| Bend of the River | Mankato | MN | United States | September | Country |
| Bender Jamboree | Las Vegas | NV | United States | September | Bluegrass |
| Berkeley Bluegrass Festival | Berkeley | CA | United States | April | Bluegrass |
| Berkeley Old Time Music Convention | Berkeley | CA | United States | September | Bluegrass |
| Berlin Fiddlers Convention | Berlin | MD | United States | September | Bluegrass |
| Big Bend Bluegrass Festival | Alpine | TX | United States | October | Bluegrass |
| Big Blues Bender | Las Vegas | NV | United States | September | Blues |
| Big Ears | Knoxville | TN | United States | March | Indie |
| Big Easy Cruise | Ft. Lauderdale | FL | United States | January | Blues, Jazz, Rock |
| Big Grass Bluegrass Festival | Paragould | AR | United States | July | Bluegrass, with influences of Americana and roots music |
| Big Lick Bluegrass Festival | Oakboro | NC | United States | April | Bluegrass |
| Big Mouth Bluegrass Festival | Grundy County | TN | United States | August | Bluegrass |
| Big Ponderoo | Sisters | OR | United States | June | Bluegrass |
| Big Sky Big Grass | Big Sky | MT | United States | July | Folk, with a blend of Americana, Roots, Singer-Songwriter, and Bluegrass influences. |
| Billings Folk Festival | Billings | MT | United States | July | Folk, with strong representation of Americana, Singer-Songwriter, and Roots music. |
| Birdfest | Pinewood | SC | United States | May | Bluegrass |
| Birdfest & Bluegrass | Ridgefield | WA | United States | October | Bluegrass |
| Biscoland | Lafayette | NY | United States | July | Indie, Rock, Folk |
| Black Bear Americana Music Festival | Kent | CT | United States | August | Americana |
| Black Hills Bluegrass Festival | Piedmont | SD | United States | June | Bluegrass |
| Black Swamp Arts Festival | Bowling Green | OH | United States | September | Variety |
| Blast on the Bay Songwriting Festival | Port St. Joe | FL | United States | October | Singer-songwriter, country, Americana |
| Blastfest | Seattle | WA | United States | July | Afrobeat |
| Blazin’ Bluegrass Festival | Whitley City | KY | United States | June | Bluegrass |
| Blazin’ Bluegrass Festival | Whitley City | KY | United States | September | Bluegrass |
| Blissfest Music Festival | Harbor Springs | MI | United States | July | Americana, Folk, Roots, Bluegrass, Singer-Songwriter, and World Music. |
| Blissfield Bluegrass on the River | Blissfield | MI | United States | June | Bluegrass |
| Blistered Fingers Bluegrass Festival | Litchfield | ME | United States | August | Bluegrass |
| Blistered Fingers Bluegrass Festival | Litchfield | ME | United States | June | Bluegrass |
| Bloomin’ Bluegrass Festival | Farmers Branch | TX | United States | October | Bluegrass |
| Blue Highway Fest | Big Stone Gap | VA | United States | October | Bluegrass |
| Blue Ox Music Festival | Eau Claire | WI | United States | June | Bluegrass |
| Blue Ridge Folklife Festival | Ferrum | VA | United States | October | Bluegrass |
| Blue Waters Bluegrass Festival | Medical Lake | WA | United States | August | Bluegrass |
| Bluegrass & Brews | Richmond | VA | United States | May | Bluegrass |
| Bluegrass & Chili Festival | Wagoner | OK | United States | September | Bluegrass |
| Bluegrass Along the Harpeth | Franklin | TN | United States | July | Bluegrass |
| Bluegrass and Beer Festival | Keystone | CO | United States | August | Bluegrass |
| Bluegrass and Country Moosic Fest and Fundraiers | Batavia | IL | United States | June | Bluegrass |
| Bluegrass at the Junction | Nashville | NC | United States | May | Bluegrass |
| Bluegrass at the Lake | Marion | KS | United States | August | Bluegrass |
| Bluegrass at the Lake | Wisconsin Rapids | WI | United States | June | Bluegrass |
| Bluegrass BBQ Fest | Lexington | KY | United States | May | Bluegrass |
| Bluegrass by the Beach | Sunset | NC | United States | April | Bluegrass |
| Bluegrass First Class | Asheville | NC | United States | February | Bluegrass |
| Bluegrass from the Forest Festival | Shelton | WA | United States | July | Bluegrass |
| Bluegrass Heritage Festival | Dallas | TX | United States | May | Bluegrass |
| Bluegrass Heritage Festival | Farmers Branch | TX | United States | August | Bluegrass |
| Bluegrass in Heaven | Silver Bay | NY | United States | September | Bluegrass |
| Bluegrass in Superclass | Oregon | OH | United States | January | Bluegrass |
| Bluegrass in the Blue Ridge | Kingsport | TN | United States | April | Bluegrass |
| Bluegrass in the Bluegrass with Sam Jam & Rudy Fest | Lexington | KY | United States | June | Bluegrass |
| Bluegrass in the Bottoms | Kansas City | MO | United States | March | Bluegrass |
| Bluegrass in the Gap | Hillsboro | VA | United States | June | Bluegrass |
| Bluegrass in the Park Folklife Festival | Henderson | KY | United States | August | Bluegrass |
| Bluegrass in the Pines | Rosholt | WI | United States | August | Bluegrass |
| Bluegrass Island Music Festival | Manteo | NC | United States | October | Bluegrass |
| Bluegrass on the Arkansas | Salida | CO | United States | May | Bluegrass |
| Bluegrass on the Beach | Lake Havasu City | AZ | United States | March | Bluegrass |
| Bluegrass on the Rim | Jackonsville | AL | United States | June | Bluegrass |
| Bluegrass Sampler | Racine | WI | United States | November | Bluegrass |
| Bluegrass, Brew, & BBQ Festival | Grand Rivers | KY | United States | April | Bluegrass |
| Boats and Bluegrass | Winona | MN | United States | September | Bluegrass |
| Boise Folk Festival | Boise | ID | United States | June | Folk, Americana, singer-songwriter, with a focus on various folk music styles |
| Bonnaroo Music Festival | Manchester | TN | United States | June | Alternative, Electronic, Hip Hop, Pop, Rock |
| Bootheel Bluegrass Festival | Fruitland | MO | United States | January | Bluegrass |
| Boots in the Park Tempe Fall | Tempe | AZ | United States | September | Country |
| Borderland Festival | East Aurora | NY | United States | September | Folk, Jam |
| Born & Raised Festival | Pyror | OK | United States | September | Country |
| Boston Folk Festival | Boston | MA | United States | August | Folk music with a focus on traditional New England styles and diverse representations of folk music from around the world |
| Bottlerock Napa Valley | Napa | CA | United States | May | Alternative, Americana, Hip Hop, Latin, Pop, R&B, Reggae, Rock |
| Bourbon & Beyond | Louisville | KY | United States | September | Bluegrass, Folk, Rock |
| Bowers Mansion Bluegrass Festival | Washoe Valley | NV | United States | August | Bluegrass |
| Boxcar Pinion Bluegrass Festival | Chickamauga | GA | United States | May | Bluegrass |
| Brantling Bluegrass Festival | Sodus | NY | United States | July | Bluegrass |
| Braun Brothers Reunion | Challis | ID | United States | August | Bluegrass, Folk, Rock |
| Breakaway Festival Michigan | Grand Rapids | MI | United States | August | Pop, Rock, Electronic |
| Briggs Farm Blues Festival | Briggsville | PA | United States | July | Blues |
| Bristol Bluegrass Spring Fest | Bristol | VA | United States | April | Bluegrass |
| Bristol Rhythm & Roots Reunion | Bristol | TN | United States | September | Old-Time, Bluegrass |
| Bristol Rhythm and Roots | Bristol | TN | United States | September | Bluegrass, Blues, Folk |
| Brooklyn Americana Music Festival | Northampton | MA | United States | September | Americana music, including folk, roots, country, bluegrass, and related genres |
| Brooklyn Americana Music Festival | Brooklyn | NY | United States | September | Americana, featuring singer-songwriter artists, with influences of folk, roots, and blues. Held across multiple venues in Brooklyn, offering a diverse lineup. |
| Brown County Bluegrass Festival | Georgetown | OH | United States | August | Bluegrass |
| Buckeye Country Superfest | Columbus | OH | United States | June | Country |
| Bumbershoot | Seattle | WA | United States | September | Alternative, Electronic, Hip Hop, Indie, Rock |
| Busy Bird Bluegrass Festival | Berkshire | NY | United States | July | Bluegrass |
