- Greg Ridley
- Greg Rike
- Greg Ritchie
- Greg Riwai
- Greg Roberts
- Greg Roller
- Greg Rose
- Greg Ross
- Greg Roth
- Greg Roz
- Greg Ruby
- Greg Ruggiero
- Greg Runions
- Greg Russell
- Greg Ryall
- Greg Ryder
- Greg Rzab
- Greg S.
- Greg Sage
- Greg Sandell
- Greg Sanders
- Greg & Sandi Gray
- Greg Sardinha
- Greg Schindel
- Greg Schneider
- Greg Schreiner
- Greg Schroeder
- Greg Schroeter
- Greg Schuler
- Greg Scott
- Greg Scott
- Greg Scott
- Greg Scott Lee
- Greg Sczebel
- Greg Seaman
- Greg Searvance
- Greg Segal
- Greg Segal
- Greg Serrato
- Greg Shafritz
- Greg Shier
- Greg Shires
- Greg Shultz
- Greg Shumake
- Greg Siegle
- Greg Silver
- Greg Silverman
- Greg Simon
- Greg Simon
- Greg Simpson
- Greg Simpson
- Greg Siokos
- Greg Skaff
- Greg Slawson
- Greg Slay
- Greg Smith
- Greg Snell
- Greg Spero
- Greg Spero Quartet
- Greg Spin
- Greg Spin
- Greg Spooner
- Greg Spradlin
- Greg Stafford
- Greg Stainer
- Greg Stainers
- Greg Starr
- Greg Starx
- Greg Steele
- Greg Stemple
- Greg & Steve
- Greg Stevens
- Greg Stevens
- Greg Stier
- Greg Stone
- Greg Strange
- Greg Street
- Greg "Stryke" Chin
- Greg "Stryke Chin"
- Greg Stuart
- Greg Stuart
- Greg Stylles
- Greg Sublett
- Greg Suffrin
- Greg Suhar
- Greg Summerlin
- Greg Susoreny
- Greg Sutton
- Greg Swim
- Greg Syafiq
- Greg Szlapczynski