We propose and defend a distinction between two types of self-censorship: public and private. In public self-censorship, individuals restrain their expressive attitudes in response to public censors. In private self-censorship, individuals do so in the absence of public censorship. We argue for this distinction by introducing a general model which allows us to identify, describe, and compare a wide range of censorship regimes. The model explicates the interaction between censors and censees and yields the distinction between two types of self-censorship. In public self-censorship, the censee aligns her expression of attitudes according to the public censor. In private self-censorship, the roles of censor and censee are fullled by the same agent. The distinction has repercussions for normative analysis: principles of free speech can only be invoked in cases of public self-censorship.