This dissertation concerns thought control activities in everyday working life. Given the almost unlimited availability of information in the digital age, combined with the increasing complexity of tasks and projects, exerting thought control is becoming more and more important. Stopping distracting thoughts and regaining control over one’s mind is therefore an important strategy for maintaining attentional and emotional control. While previous research on thought control has mostly been conducted in the laboratory and mainly dealt with the process itself, I seek to transfer such research into everyday working life and investigate it in an embedded manner – including variables that precede, moderate, and follow thought control activities. As individual thought control ability has been identified as a key variable theoretically and empirically, particular attention is paid to its assessment. Within the scope of my dissertation project, four studies were conducted. The first study demonstrates the importance of limiting the quantity of unnecessary external (e.g., outdated files) and internal (e.g., distracting thoughts) information by first reviewing the literature on intentional forgetting and thought control. In a second step, the reviewed literature is used to identify mechanisms of action for a conceptual prototype of a computer-based assistive system to support employees in managing irrelevant external information. Thirdly, to more deeply address internal processes in dealing with distracting thoughts, we conducted a qualitative critical incident study to examine why (functions and consequences) and when (situational predictors) employees typically want to control their thoughts in the work context. Sixty-five participants told stories of incidents in which they were motivated to forget at work and answered further prompts, which were then clustered into categories. The main situational predictors of exerting thought control identified were related to specific working conditions (e.g., time pressure, breaks), task characteristics (e.g., complexity, novelty), and social interactions. The main observed functions and consequences of thought control in the workplace were emotion regulation, maintenance of attentional control, maintenance of social relationships, preservation of self-image, knowledge acquisition, and goal attainment. These results shed light on why and where thought control activities are important in everyday working life, and thus provide a basis for further empirical and practical implications. Study 2 addresses the predictors more deeply and investigates how different personal and situational variables relate to thought control activities in the work context. Specifically, it examined how time pressure, task complexity (empirically identified situational variables from Study 1) and individual differences in thought control ability (personal variable) relate to the activation and perceived effort of thought control processes. A laboratory task assessing 143 employees’ ability to suppress unwanted thoughts (think/no-think paradigm) was combined with a five-day experience sampling study in the work context. Multilevel analyses revealed positive effects of task complexity and thought control ability on the activation of thought control, but underlined the importance of considering person-situation interactions with regard to time pressure: Employees engaged more often and more intensively in thought control activities at moderate levels of time pressure, but only when they had a higher ability to control their thoughts. In contrast, for employees with lower thought control ability, increasing time pressure was negatively related to the activation of thought control activities. Thus, individual thought control ability plays a decisive role in determining the impact of situational variables. Study 3 focuses on the consequences of thought control activities in the work context. Building on the results of Study 1, we examined the protective function of thought control activities for affect (emotion regulation), task focus (attentional control), and self-esteem (preservation of self-image). Individual differences in thought control ability were again considered in all assumed relationships, and we also examined possible mediating roles of negative affect and task focus on self-esteem. Data analyses relied on the same study setup and sample as Study 2 (N = 143 employees). Multilevel modeling results showed that individuals with lower thought control ability experienced higher negative affect and subsequently lower self-esteem after performing thought control activities, whereas individuals with higher ability did not. These findings underline the generally protective nature of thought control ability, but also point to possible detrimental aspects of unsuccessful thought control attempts. Thus, the benefits of thought control activities highly depend on their actual success. As thought control ability was found to be a central moderator variable both in predicting thought control activities (Study 2) and in their consequences (Study 3), Study 4 fully concentrates on the assessment of this construct. We compared task-based (think/no-think paradigm) and different self-report questionnaire measures within a meta-analytic framework (k = 20; N = 1,194). The overall correlation of r = .07 between the two types of measures was small and did not differ significantly from zero, and none of the contemplated moderators (age, gender, publication status, presentation order, type of self-report questionnaire) mattered. The results of an additional robust Bayesian meta-analysis tend to point to a null model rather than one with a medium effect size, but do not provide definitive evidence. Thus, it seems to be the case that task-based and self-report measures of thought control ability do not substantially overlap. This finding is discussed with respect to systematic differences in the underlying psychological processes captured by the two measures. The present dissertation contributes to the literature on thought control in several ways. It addresses thought control activities in an embedded manner by examining their predictors (Study 1, Study 2) as well as their consequences (Study 1, Study 3). Moreover, the whole process is investigated in an applied setting, which increases the external validity of the findings and connects laboratory research to everyday working life (Studies 1 – 3). Particular attention is drawn to individual differences in thought control ability, which were addressed theoretically (Study 1), empirically (Study 2, Study 3), and methodologically (Study 4). Overall, the results of the four studies suggest that intentional thought control activities are not only a laboratory phenomenon, but also play a protective role in everyday working life – especially in demanding situations. Thereby, the individual ability to control thoughts is involved in several processes and thus deserves particular attention in both future research and potential practical interventions.