This study examined the influence of the Situational Leadership model on Employee Commitment in Youth Enhancement Organisation (YEO), a Non-Governmental Organisation in Owerri, Nigeria. The study evaluated the impact of the directive and supportive leadership Behaviours on Affective and Continuance Employee Commitment. Data were collected from 143 employees from the different departments of YEO using a structured questionnaire adopted and modified from previous studies. Multiple Regression Analysis for the data gave a significant impact between Directive Leadership Behaviour (β = 2.323, p<0.01), and Supportive Leadership Behaviour (β = 1.424, p<0.0) on Employee Commitment. It also shows a significant impact between Directive behaviour (β = 1.514, p<0.01) and affective commitment, Supportive Leadership Behaviour (β = 3.123, p<0.01) on Continuance Employee Commitment The findings of this study reveal that Situational Leadership of Directive and Supportive have a positive impact on Employee Commitment (affective and continuance) and are ideal in sustaining affective and continuance commitment in the Organisations. It is hoped that the study would convince the leadership of similar organisations to be proactive in embracing situational leadership styles, especially in dynamic environments and situations.