Caustic Resin is an indie rock band from Boise, Idaho, who have released several albums for Up Records, Alias Records, and C/Z Records. The band is Brett Netson on guitar and vocals, Tom Romich, Jr. on bass guitar, and either James Dillion or Pat Perkins on drums. The sound of the band somewhat similar to the psychedelic blues-rock of the 1960s, and is marked by Netson's distinctive voice and slide guitar work.

The band has several ties to fellow Boise indie rockers, Built to Spill. Netson was one of its original members; he played bass on its debut, Ultimate Alternative Wavers, but was replaced (along with drummer Ralf Youtz) as per band leader Doug Martsch's wishes to record with a different lineup for each record. Netson contributed various parts to Built to Spill albums Perfect from Now On, Ancient Melodies of the Future and You in Reverse before becoming a full-time member (again) after the latter was released. Built to Spill and Caustic Resin collaborated on the 1995 release, Built to Spill Caustic Resin. The two bands also recorded the track "Still Flat", which appeared on the Red Hot + Bothered benefit CD produced by the Red Hot Organization, and was later collected on Built to Spill's The Normal Years compilation.