- Sonya Marie -- Sound Stop Music Presents
- Sour Diesel Trainwreck -- South 85
- South Austin Jug Band -- South Sixty-Five
- South85 -- Southern Eagle String Band
- Southern Express -- Southern Pacific
- Southern Rail -- Southerner
- Southpaw Bluegrass Band -- Spade Cooley & His Orchestra
- Spade Cooley & His Western Swing Band -- Spartacus Jones
- Spazz Sparkman -- Special Ed
- Special Ed -- Speedtrucker
- Speedy Rodgers -- Spencers
- Spider Wilson -- Spivey Crossing
- Splinter Middleton -- Spongefinger
- Spooney Five -- Spring Creek Bluegrass Band
- Springer! -- St. Pete Mountain Boys
- Stacey Baltes -- Stacey Quin
- Stacie Lynn Hines -- Stacy Phillips & John Sholle
- Stacy Whited -- Stan
- Stan Allen -- Stan Davey
- Stan Garland -- Stan Silver
- Stan Swiniarski -- Stancer Quartet