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|Origin||Los Angeles, California, United States|
|Associated acts||The Bicycle Thief, Red Hot Chili Peppers, Jane's Addiction, Fishbone, Porno For Pyros, Guns n Roses, 45 Grave|
Thelonious Monster is a punk rock band from Los Angeles, led by singer-songwriter Bob Forrest. Active from 1983 to 1994, and again since 2004, the band has released five original studio albums. Despite never achieving mainstream success, a number of popular acts cite them as influential.
Members included Forrest on vocals; bass players Jon Huck, Rob Graves and Martyn LeNoble; guitarists Chris Handsone, Bill Stobaugh, Dix Denney, Zander Schloss, Mike Martt, Jon Sidel; and drummer Pete Weiss. They were a popular live attraction in the underground rock clubs of Hollywood in the 1980s and put out a series of critically acclaimed albums, but never achieved major commercial success. 
After several years of sporadic activity and side projects by Forrest, Thelonious Monster reunited in 2004 at the Coachella Valley Music and Arts Festival in Indio, California and at the Sunset Junction Street Fair in Los Angeles, and released their first new album in 12 years. California Clam Chowder would feature guitarist Josh Klinghoffer, who was also a member of Forrest's short-lived band, The Bicycle Thief. Klinghoffer would eventually go on to replace John Frusciante in the Red Hot Chili Peppers.
In 2009 Thelonious Monster reunited for their first shows in five years. The band played a show at The Echo in Los Angeles as a warm-up for dates on Warped Tour, and a show at Pappy And Harriet's in Pioneertown, California.
Former members of Thelonious Monster are featured in the 2011 documentary Bob and the Monster, which details the life and career of Bob Forrest.
In 2019, Bob announced on his Instagram account that Thelonious Monster were in the studio working on a new album. He also posted a photo of Dix Denney and Josh Klinghoffer working in the studio.
- Bob Forrest – lead vocals (1984–1994, 2004–present)
- Pete Weiss – drums, percussion (1984–1994, 2004–present)
- Dix Denney – guitar (1984–1994, 2004–present)
- Zander Schloss – guitar (1992–1994, 2009–present)
- Mike Martt – guitar (1989-1991, 2009–present)
- Dallas Don Burnet – bass (1992-present)
- Chris Handsone (a.k.a. "Chris Handsome") — guitar (1984–1994)
- Jon Sidel — guitar (1992–1994, 2004)
- K. K. Barrett - guitar (1986)
- Bill Stobaugh — guitar (1986)
- John Huck — bass (1984–1988)
- Martyn LeNoble - bass (1990–1992)
- Rob Graves - bass (1988 - 1990)
- Mark E. Hall - guitar (1989)
- Baby...You're Bummin' My Life out in a Supreme Fashion (1986)
- Next Saturday Afternoon (1987)
- Stormy Weather (1989)
- Beautiful Mess (1992)
- California Clam Chowder (2004)
Singles & EPs
- The Boldness of Style (1987)
- So What If I Did (1989)
- Blood Is Thicker Than Water (1992)
- Body and Soul? (1993)
- Adios Lounge (1993)
- Chicago Sun-Times, May 19, 1989, Thelonious Monster storms into Chicago by Dave Hoekstra
- O'Neill, Ann (December 14, 2011). "Risen from the gutter, he whispers hope to Hollywood's junkies". CNN. Retrieved December 18, 2018.