A Fever You Can't Sweat Out is the debut studio album by Las Vegas-based alt-rock band Panic! At the Disco.

The group formed in Las Vegas in 2004 and began posting demos online, which caught the attention of Fall Out Boy bassist Pete Wentz. Wentz signed the group to his own imprint label, Decaydance, without them having ever performed live. The album was recorded on a small budget at SOMD! Studios in College Park, Maryland over several weeks in June 2005 with Matt Squire. 

The group had only graduated high school one month before. With lyrics written by lead guitarist/backing vocalist Ryan Ross, the record covers social issues and topics such as sanctity of marriage, adultery, mental health, alcoholism and prostitution are woven throughout the album. The album is divided into halves stylistically; the first half is primarily pop punk with elements of electronic, while the second employs more traditional instrumentation, with influences of baroque pop and swing.