People change their attitudes towards objects based on their co-occurrence with positive or negative stimuli, an effect called Evaluative Conditioning (EC). Previous research has primarily focused on studying the change in attitude valence as an outcome of EC, but has neglected that people can also be more or less certain of their attitude. In this talk, we will present several experiments studying the antecedents and consequences of attitude certainty in evaluative conditioning. We will discuss how repetition, stimulus frequency, memory, and attitude extremity relate to attitude certainty in evaluative conditioning.