This article investigates the scope and meaning of ancient Greek personal religion as an additional dimension - besides official (polis) religion - in which the ancient Greek religious experience articulates itself. I show how ‘personal religion’ is a rather broad and amorphous scholarly category for a number of religious beliefs and practices that, in reflecting individual engagement with the supernatural, do not fit into our conception of polis religion. At the same time, I argue that personal religion should not be seen simply as that which is not official Greek religion. Nor is personal religion simply ‘private’ religion, oikos religion or the religion of those who had no voice in the sphere of politics (metics, women). Rather, ‘personal religion’ combines aspects of public and private. It is a productive category of scholarly research insofar as it helps us to appreciate the whole spectrum of ways individuals in the ancient Greek city received and (if necessary) altered culturally given religious beliefs and practices. Indeed, the examples discussed in this paper reveal a very Greek conversation about the question of what should count as a religious sign and who was to determine its meaning.