Dennis Gruenling is an American electric blues harmonicist, songwriter, record producer and radio DJ. He has released seven albums since 1999, with his most recent being 2016's Ready or Not. His contributions to other musician's albums has included stints playing the harmonica, audio engineering and mixing, production and album sleeve artwork. Gruenling has also been employed for over a decade as a DJ on WFDU college radio. His dynamic harmonica playing style has been inspired variously by Little Walter, Lester Young and Illinois Jacquet.
Gruenling, who plays both chromatic and diatonic harmonica, has been awarded the title of 'Best Modern Blues Harmonica Player' three years in a row by Real Blues magazine.
In 2007, Adam Gussow described Gruenling as having "limitless potential". In 2019, he won a Blues Music Award for 'Instrumentalist - Harmonica'.