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Spanish Journal of PsychologyThe current way of organizing and working together in organizations is undergoing continual change.Organizations face challenges and difficulties to which they must adapt in order to be competitive, particularly when facing the current recession, new technology improvements, merges and differences that come with a global market, and changes in both customer and employee needs and values (Rodríguez-Carvajal, Moreno-Jiménez, de Rivas-Hermosilla, Álvarez-Bejarano, & Sanz-Vergel, 2010). At the same time, there is an increasing demand for a more ethical peoplecentered management (van Dierendonck, 2011), a management that can combine the constant demand for efficiency and efficacy with a moral focus. Within this context, leadership has been pinpointed as a key factor to achieving committed workers as well as prosperous organizations (Luthans, 2002;van Dierendonck, 2011). In this line, servant leadership (SL) may play an important contribution in achieving those goals. At this respect, SL has been proposed as a leadership style specifically focused on people and their development (Greenleaf, 1977). Greenleaf described a servant leader as follows: "The servant-leader is servant first. It begins with the natural feeling that one wants to serve. Then conscious choice brings one to aspire to lead." (Spears, 1998, p. 1). Therefore, a servant leader is one who is mainly concerned about his followers (Greenleaf, 1977). In contrast to other leadership theories as for example transformational leadership, inspiring leadership or Level 5 leadership, SL makes explicit the moral and social concerns and it sets first followers´ needs even over organizational goals (Hunter et al., 2013, van Dierendonck, 2011. In its application, this leadership has been observed to be related to effective performance, organizational citizenship behavior, job satisfaction, commitment and the appearance of organizational trust climate, among others (e.g. Hunter et al., 2013; van Dierendonck, 2010, for a review).Based on its value, the global context brings also the challenge of studying SL within a cross-cultural setting so that attention for possible culture differences should be brought to the front (Mooij & Hofstede, 2010 Abstract. Servant Leadership emphasizes employee's development and growth within a context of moral and social concern. Nowadays, this management change towards workers´ wellbeing is highlighted as an important issue. The aims of this paper are to adapt to Spanish speakers the Servant Leadership Survey (SLS) by van Dierendonck and Nuijten (2011), and to analyze its factorial validity through confirmatory factor analysis and measurement invariance in three countries. A sample of 638 working people from three Spanish-speaking countries (Spain, Argentina and Me...