- , an investor-owned utility ( Energy ) company.
- , a note and acknowledgment of personal debt (i.e. "I Owe Unto" or "I Owe U {Link without Title} ") that is generally limited to casual usage between acquaintances.
- A band that three members of Westlife were once in.
IOU can also refer to I Order U (you) when people chat on instant messenger (AIM)
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