Festival dijadwalkan dari 07 Agu hingga 09 Agu 2009 (2 hari).
Lollapalooza Chicago berlangsung di Chicago, United States. Berikut adalah alamat lengkap festival: GRANT PARK – CHICAGO, IL
Arctic Monkeys, Depeche Mode, The Killers, Tool, Bon Iver, Snoop Dogg, Kings of Leon, Eric Church, Rise Against, Coheed and Cambria.
Genre dan sub-genre yang paling populer dari edisi sebelumnya adalah:
rock
electronic
folk
indie rock
indie
alternative
alternative rock
indie pop
electronica
experimental
blues rock
garage rock
indie folk
americana
dance
electro
folk rock
electro house
post-punk