Robert O'Neil "Bob" Forrest (born February 15, 1961) is the lead vocalist and lyricist for Los Angeles bands Thelonious Monster and The Bicycle Thief. In September 2006 he released his first solo album, Modern Folk And Blues Wednesday. He is also a drug counselor, appearing alongside Dr. Drew Pinsky on Celebrity Rehab and Sober House, He contributed the song "Moonshiner" to the I'm Not There soundtrack.

Forrest is the former Chemical Dependency Program Director at Las Encinas Hospital, In 2010, he and co-founder Shelly Sprague launched Hollywood Recovery Services.

Forrest is also well known as a close friend of Red Hot Chili Peppers bandmates Flea and Anthony Kiedis who was once a drug buddy to Forrest and who later got clean with Forrest's help. The Red Hot Chili Peppers and Forrest's bands also have a longtime connection. In 1988, John Frusciante was originally intended to join Thelonious Monster however he joined the Red Hot Chili Peppers instead while current Chili Peppers guitarist, Josh Klinghoffer played with both Thelonious Monster and The Bicycle Thief. Forrest has performed many times with the Red Hot Chili Peppers dating back to the mid-1980s and most recently in 2009 at an awards event honoring Kiedis for his commitment to helping other addicts with the addiction and recovery process.

In 2008, he began releasing a series of live digital EPs exclusively at his official website. In 2010, Forrest began hosting a weekly radio show, All Up In The Interweb, airing Wednesday nights on Indie1031