Dredg (stylized as dredg) is an American rock band formed in 1993 in Los Gatos, California. The band's lineup consists of vocalist Gavin Hayes, guitarist Mark Engles, bassist Drew Roulette and drummer and pianist Dino Campanella.

Originally starting out as an alternative metal outfit, Dredg established themselves in the indie scene with their debut album Leitmotif (1999), which showed the band stylistically moving into progressive rock and art rock; the album's local success landed them a deal with Interscope Records in 2001, who re-released the album later in the year. Dredg's major label debut, El Cielo (2002), was lauded by critics and helped establish a wider cult following for the band. The band experienced mainstream success with Catch Without Arms (2005), which became the band's first album to chart in the United States, and the band received exposure on MTV with the single "Bug Eyes". Following their departure from Interscope in 2009, Dredg independently released The Pariah, the Parrot, the Delusion, which saw the band reach their highest charting positions yet. The band's fifth album, Chuckles and Mr. Squeezy (2011), was a stylistic departure for the band and received a negative response from the band's fanbase. Following the conclusion of the album's promotional tour in May 2014, the band went on an "extended hiatus".

In January 2018, the band announced that they had reunited and have since been writing material for their sixth studio album; they were planning to record the album in the winter of 2022. However, as of 2025, this album hasn't been released.

While attending middle school in Los Gatos, Engles and Campanella started playing together. After they graduated to Los Gatos High School, older friends Hayes and Roulette joined the group.

In a 2005 interview, when asked about the origin of the band's name, Campanella said, "It was so long ago that we named it I can't even remember. Honestly, we don't even like the name anymore. We mostly don't like the way it sounds. It doesn't roll off the tongue well."

In 1996, Dredg recorded and released their first demos of original material, the Conscious EP, garnering them exposure as far away as Boston. Currently, very little information has ever been released about these demos. In 1997, they released what would become the early stages of their musical transition, the Orph EP. It includes the group's first instrumental track, "Orph". Additionally, the track "Kayasuma" shares its title with the name of the shaman in Leitmotif's liner notes for "Lechium". With the release, Dredg slowly built a name for themselves in the Bay Area, as well as on the East Coast, such as in Boston and New York.

In May 1999, Dredg independently released their first full-length, Leitmotif, a concept album about a man traveling the world to cure his moral disease. The story was included in the liner notes, in lieu of the actual lyrics. Written by Roulette, the band had planned to release a movie of the story; however, upon the death of the lead actor, the project was scrapped.

Over the next two years, Dredg toured mostly within California, slowly expanding their fan base. The band began sending out a demo tape to several labels with four new songs intended for their next album, "Of the Room", "Redrawing the Island Map", "Running Through Propellers" and "The Papal Insignia". In January 2001, Dredg was offered a deal by Interscope Records, and the band signed to the label in February 2001. As part of the deal, Leitmotif was re-released by Interscope on September 11, 2001.