Theramenes (; ; died 404 BC) was an Athenian statesman, prominent in the final decade of the Peloponnesian War. He was particularly active during the two periods of oligarchic government at Athens, as well as in the trial of the generals who had commanded at Arginusae in 406 BC. A moderate oligarch, he often found himself caught between the democrats on the one hand and the extremist oligarchs on the other. Successful in replacing a narrow oligarchy with a broader one in 411 BC, he failed to achieve the same end in 404 BC, and was executed by the extremists whose policies he had opposed.