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Abstract: The current chapter revisits an earlier account (2005) of how inner speech leads to self-reflection. Definitions, functions, neuroanatomy, and measurement of self-reflection and inner speech are first presented, followed by the detailed proposal suggesting that these two processes are connected in at least three possible ways. Empirical evidence supporting this proposal is discussed, as well as theoretical considerations pertaining to underlying mechanisms explaining how self-reflection and inner speech may interrelate. To illustrate, several self-referential tasks used in typical fMRI studies show a reliable activation of the left inferior frontal gyrus—the main brain area known to sustain inner speech; inner speech can reproduce (i.e. internalize) already existing social mechanisms leading to self-reflection. Some possible philosophical and clinical implications of the role played by inner speech in self-reflection are outlined in conclusion.