Papyrus Oxyrhynchus 16 (P. Oxy. 16) is a fragment of the fourth book of the History of the Peloponnesian War by Thucydides (chapters 36-41) in Greek. It was discovered by Grenfell and Hunt in 1897 in Oxyrhynchus. The fragment is dated to the first century. It is housed in the University of Pennsylvania Museum (E 2747).^[1] The text was published by Grenfell and Hunt in 1898.^[2]

The manuscript was written on papyrus in the form of a roll. The measurements of the fragment are 256 by 200 mm. The fragment contains three columns, written in 50-53 lines per column. The text is written in a small and irregular uncial hand.^[3]