Accordion may refer to:

• Accordion, a musical instrument of the handheld bellows-driven free reed aerophone family, sometimes referred to as a squeezebox
• Accordion (solitaire), a solitaire card game
• "Accordion," a song by Madvillain from their album Madvillainy
• Accordion cut, a technique in butchery similar to butterflying
• Accordion (GUI), a graphical user interface widget in which several sections of a document can be expanded or collapsed
• Any object with features resembling an accordion or its bellows