Prolonged deprivation of personal control induces cognitive, motivational, and affective impairments that can lead to learned helplessness syndrome. Research on cognitive mechanisms involved in responding to uncontrollable events reveals a critical role of lack of contingency between one's action and outcomes. However, the impact of experienced uncontrollability on individuals' sense of self-agency has not been explored yet. This research examined how prolonged control deprivation affects implicit sense of agency. We exposed participants to action-outcome noncontingency of varying lengths and measured implicit sense of self-agency manifested in intentional binding. In 2 studies (N = 133 and N = 354, respectively), we found that control deprivation decreased the intentional binding effect, and that the relationship appeared to be monotonic: the longer the control deprivation, the smaller the intentional binding effect. Moreover, in the condition of prolonged control deprivation, no intentional binding was observed at all: Participants evaluated the time elapsing between the action and the effect as if both occurred separately. Our finding suggests that long-term exposure to uncontrollability has detrimental effects on the ability to detect consequences of one's actions, the basis of implicit self-agency. The implications of our results for the theory of control deprivation and sense of agency are thoroughly discussed. (PsycInfo Database Record (c) 2021 APA, all rights reserved).