Mental imagery, or 'seeing with the mind's eye' (Kosslyn . ), provokes strong emotional responses (Ji ., ). To date, there is a lack of data on the content and clinical characteristics (e.g. vividness, likelihood, emotional effects) of spontaneous mental images (MI) in people with bipolar disorder (BD) according to their thymic states.The current study sought to assess the characteristics associated with the contents of MI in people with BD.Forty-two euthymic individuals diagnosed with BD (American Psychiatric Association, ) were asked to self-report their MI during depression, (hypo)mania and euthymia. Participants also rated levels of vividness, likelihood and emotional activation related to MI (i.e. valence, arousal, type of emotion).The contents of the MI revealed phenomenological aspects of BD. Different themes were associated with each thymic phase. In (hypo)mania and in euthymia, the mental images were assessed as being as vivid as probable (>.05). (Hypo)manic and euthymic-related MI activated more pleasure than displeasure (<.001) and were mainly associated with joy. In depression, MI were assessed as more vivid than likely (<.05). In depression, MI activated more displeasure than pleasure (<.0001) and induced mainly sadness.Overall, a congruence between the contents of images and the three thymic phases was found. The content of the MI was related to self-reported emotional effects that were congruent with the thymic phases concerned. The results add new clinical information for the use of imagery-based cognitive therapy in individuals with BD.