Deliberation is considered to produce positive effects on public opinion, in that it exposes participants to alternative perspectives and rational arguments. However, whereas benefits of face-to-face deliberation have been supported by many empirical studies, the effects of online deliberation remain unclear to date. This research compares the effects of online and face-to-face deliberation in experimental settings. A theoretical review of computer-mediated communication and deliberative democracy suggests that online deliberation is not necessarily inferior to face-to-face deliberation. An experiment was conducted to compare the relative outcomes of a deliberation performed in face-to-face and computer-mediated settings. The results suggest that both online and face-to-face deliberation can increase participants’ issue knowledge, political efficacy, and willingness to participate in politics.