Papyrus Oxyrhynchus 581 (P. Oxy. 581 or P. Oxy. III 581) is a papyrus fragment written in Ancient Greek, apparently recording the sale of a slave girl. Dating from 29 August 99 AD, P. Oxy. 581 was discovered, alongside hundreds of other papyri, by Bernard Pyne Grenfell and Arthur Surridge Hunt while excavating an ancient landfill at Oxyrhynchus in modern Egypt. The document's contents were published by the Egypt Exploration Fund in 1898, which also secured its donation to University College, Dundee, later the University of Dundee, in 1903 – where it still resides. Measuring 6.3 x 14.7 cm and consisting of 17 lines of text, the artifact represents the conclusion of a longer record, although the beginning of the papyrus was lost before it was found. P. Oxy. 581 has received a modest amount of scholarly attention, most recently and completely in a 2009 translation by classicist Amin Benaissa of Lady Margaret Hall, Oxford.
The fragment probably documents the registration of a slaving sale with Oxyrhynchus' agoranomeion, a Roman civic institution involved with record-keeping and the supervision of taxation. P. Oxy. 581 mentions four individuals; the slave herself, likely an eight year-old female; the unnamed purchaser, for whom the transaction is being registered; Demas, brother of the purchaser as well as the slave's previous owner and Caecilius Clemens, an unspecified notary also connected to four other Oxyrhynchus Papyri dating from 86 AD–c.100 AD. An "inadvertent scribal omission",[1] whereby the stated value of 3,000 bronze drachmas, a largely obsolete currency, was not converted into its equivalent worth in silver, is regarded as an unusual mistake and has served to distinguish the record.