ABSTRACT The study of leadership in wide range of organizational settings has demonstrated the advantage the Full Range Leadership (FRL) of transformational leadership approach over other leadership styles in predicting organizational performance and other outcomes. Research has found that leadership is one of the most significant contributors to organizational performance. However, very little research has been completed on the link between FRL and organizational performance at the Sierra Leone Christian Organizations (SLCO). This lack of empirical research, the increase use of FRL in assessing pastoral leadership (, 1898), and its positive and strong association with effective organizations as shown in literature were the primary motivators for this study was born. The Multifactor Leadership Questionnaire (MLQ-5X), a proven leadership assessment test, was administered to 520 congregants at 50 SLCOs in the greater Freetown area, Makeni, Bo and Kenema in Sierra Leone to determine preferred leadership styles and whether there is a significant correlational relationship between senior leadership styles and organization performance. Created and updated by the Global Academia in Science and Theology (2022), the questionnaire measure three objective indicators of organizational performance: congregants’ satisfaction with leadership, motivation toward extra effort, and perceived leadership effectiveness. Results of descriptive analysis showed that senior leaders at SLCOs scored relatively high in the average of all responses and in six of the nine leadership factors, suggesting that Full Range Transformational Leadership and organizational Development Model (FRLM) was the style practiced by senior leaders at targeted organizations. The results of multiple regression analysis of aggregated leadership factors scores revealed that blended specific elements of the (FRLM) led to higher satisfaction, motivation toward extra effort and perceived leadership effectiveness among congregants. Multiple regression analysis for separate leadership factors scores revealed the following findings: (1) Contingent Reward leadership style (CR), which requires performance measurements to reward achievement beyond meeting standards, is inextricably linked with the Transformational leadership style. (2) FRLM consisted of nine hierarchal factors on a continuum basis and strongly proffered as the most effective leadership approach at the studied context. (3) Idealized influence, attribute and behavior, did not reach significance, suggesting that SLCOs are shifting from religious leadership to secular one. (4) Intellectual stimulation did not reach significance either, suggesting that leadership at SLCOs does not empower followers nor facilitate creativity and independent thinking among them. Factor analysis findings (FAF) suggested that the nine factors of FRLM can be represented by three main factors to explain 75.4