The aim of this work is to contribute to elucidate Wittgenstein’s conception of Judaism. It is generally acknowledged that Otto Weininger’s work influenced the thought of Wittgenstein, but there is no agreement on the content of that influence. Here we argue that it is perceptible not only in the wittgensteinian conception of ethics, geniality, talent, etc., but also in his characterization of Judaism and the way the philosopher uses this idea.