IU’s Original Compostions (Both lyrics and melody bởi IU) 

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Hold my Hand (‘The Greatest Love’ OST)

Peach (‘Spring of a 20 Year Old’ single) - Arranged by IU and G.Gorilla

Uaena Song (4th anniversary gift to fans)

Beautiful Song (YTBLSS duet with Jo Jungsuk)

Drama (First performed at IU’s Small Theatre Concert)

Knee (Released through IU’s Twitter as a gift for MAMA)

Heart (‘Producer’ OST released as a birthday gift for fans)

Christmas Wish (‘Mystic Holiday 2013’ album) - Lyrics by IU and Various Artists

Alone in the Room (‘Real’ mini-album) - Lyrics by IU and Choi Gapwon

Uncle (‘Last Fantasy’ album) - Lyrics by IU and Lee Juck

Wisdom Tooth (‘Last Fantasy’ album) - Lyrics by IU and G.Gorilla

Everything’s Alright (‘Last Fantasy’ album) - Lyrics by IU and Kim Hyuncheol

Teacher (‘Last Fantasy’ album) - Lyrics by IU and Ra.D

Not Spring, Love, or Cherry Blossoms (HIGH4 debut single) - Lyrics by IU, Rap by Geeks Lil Boi