In this paper I argue against three leading accounts of self-deception in the philosophical literature and propose a heretofore overlooked route to self-deception. The central problem with extant accounts of self-deception is that they are unable to balance two crucial desiderata: (1) to make the dynamics of self-deception (e.g., the formation of self-deceptive beliefs) psychologically plausible and (2) to capture self-deception as an intentional phenomenon for which the self-deceiver is responsible. I argue that the three leading views all fail on (...) one or both counts. However, I claim that many or most cases of self-deception conform to a different model, which I call ‘Self-deception as Omission’. In these cases, the process of self-deceptive belief formation and the intentional act for which the self-deceiver is responsible come apart, allowing us to meet both desiderata. Self-deceptive beliefs are often formed by unconscious mechanisms closely analogous to the 'System 1' processes of dual-systems psychology, or by other mechanisms of motivated reasoning. The nascently self-deceptive subject then acquiesces in the comforting belief and commits an epistemic failure by allowing it to persist. If this is done for motivationally biased reasons — e.g., preferring that the belief in question be true — then the subject is self-deceived and is blameworthy for her epistemic omission. (shrink)