The main goal of this study was to develop a scale for measuring Disengaging Leadership (DEL) behaviors and to provide preliminary evidence for its validity. Developing such new measures is needed given current concepts that tap into negative leadership behaviors are rarely based on a sound theoretical framework. Drawing on the core premises of Self Determination Theory (SDT) regarding employees’ basic needs and, more specifically, building on its more recent extended framework, including employees’ needs frustration, we derived four dimensions that constitute Disengaging Leadership behaviors (coercive disengaging leadership, isolating disengaging leadership, eroding disengaging leadership, and demotivating disengaging leadership). To examine the factor structure and psychometric properties of the new Disengaging Leadership Scale (DLS), Exploratory Factor Analysis (EFA), Confirmatory Factor Analysis (CFA), and reliability analyses were conducted. Results supported the hypothesized four-factor structure of the DLS and showed that this factorial structure remained invariant across employees occupying blue-collar, white-collar, and managerial positions. Finally, we successfully tested convergent, divergent, and construct validity of DLS. We established that DEL is associated with employees’ needs frustration and with their experiences of emotional exhaustion. It is concluded that the DLS has sound psychometric properties and can be used in future research on the dark side of leadership (download full article).