The complaint tablet to Ea-nāṣir (UET V 81) is a clay tablet that was sent to the ancient city-state Ur, written c. 1750 BCE. The tablet, which measures 11.6 centimetres (4.6 in) high and 5 centimetres (2.0 in) wide, documents a transaction in which Ea-nāṣir, a trader, allegedly sold sub-standard copper to a customer named Nanni. Nanni, dissatisfied with the quality, wrote a cuneiform complaint addressing the poor service and mistreatment of his servant.

Discovered by Sir Leonard Woolley in Ur, it is currently kept in the British Museum. Written in Akkadian cuneiform, this tablet is recognized as the "Oldest Customer Complaint" by Guinness World Records. From 2015 onwards, the tablet's content and Ea-nāṣir in particular gained popularity as an internet meme, due to its modern-sounding nature of dissatisfaction with goods.