Look up IOU in Wiktionary, the free dictionary.

An IOU is an acknowledgment of debt.

IOU may also refer to:

Music

• I.O.U. (album), album by British jazz fusion guitarist Allan Holdsworth, 1982
• I.O.U., album by Gregory Isaacs, 1982
• "I.O.U." (Freeez song), 1983
• "I.O.U." (Jimmy Dean song), 1976
• "I.O.U." (Mike Shinoda song), 2018
• "I.O.U." (Lee Greenwood song), 1983
• "IOU", 2022 song by Five Finger Death Punch from AfterLife
• "I.O.U", 2020 song by NCT from NCT 2020 Resonance Pt. 2
• I.O.U. (hip hop group)

Organizations

• Investor-owned utility, a supplier of basic services
• Intercultural Open University Foundation, a distance education institution
• Islamic Online University, an online, distance-learning university founded by Bilal Philips
• International Ornithologists' Union, new name of the International Ornithological Committee

Other uses

• Interdependent Occupational Unit, the monetary unit of the Kingdom of Lovely in the British television series How to Start Your Own Country
• GURPS Illuminati University, a sourcebook for the GURPS role-playing game
• Intersection over union, a measure for the similarity of two sets, which is also known as Jaccard index

See also

• IOYOU, former name of the Irish pop vocal group Westlife
• I Owe You, debut studio album by American contemporary gospel singer Kierra "Kiki" Sheard
• AEIOU (disambiguation)