Ash Grunwald (born Ashley Mark Groenewald, 5 September 1976) is an Australian blues musician.

Under the guidance of his grandfather, Ash learned to play guitar and bass as a young child and together they recorded his first ever song – a cover of Howlin' Wolf's "Going Down Slow".

[1] The album included six originals, two Waits compositions, "Going Out West" and "Jesus Gonna Be Here" and blues standards.

[2][1][9] Several tracks gained significant airplay on the national youth broadcaster Triple J some of these included "Breakout", "Devil Called Me a Liar" and "Joke on Me".

[10] Fish Out of Water was nominated 'Best Blues and Roots Album' at the 2009 ARIA Awards, Grunwald's fourth in this category.

[6] In October 2009 Grunwald recorded a performance at Fremantle's Fly By Night club for a release as a live album in early 2010.

The Album featured contributions from Mr Trials, Countbounce, Chasm, Fingers Malone, Benny Owen and Kanchana Karunaratna.

[6] By the end of 2010, Grunwald relocated with his family to Byron Bay and it was here he began recording his sixth studio album, the 2012 release Trouble's Door.

The unplanned success of the single took the three back into the studio where they re-recorded some of Grunwald existing tracks; adding a driving rhythm section.

Throughout 2014, Grunwald toured rigorously overseas, most significantly supporting Xavier Rudd throughout the United States.

In 2019, Grunwald signed with Bloodlines Music, the company re-released his back catalogue on vinyl in February 2019.

In the book, Grunwald interviews 15 of the world's top surfer-musicians; including Kelly Slater, Stephanie Gilmore, Jack Johnson, Dave Rastovich, Pete Murray, G. Love and many more.