The present study intends to test how the factors of Emotional Intelligence (EI) impacts Team Building (TB) through mediation of Leadership Effectiveness (L) by suggesting proposed models on the basis of past literature. A sample of 263 employees working in Information Technology (IT) sector in Delhi/NCR was taken to test the hypotheses. The direct and indirect effects were explored through Structural equation Modelling (SEM) and Bootstrapping using AMOS v 26. The results satisfactorily supported the direct effects of EI on TB, whereas, indirect effects through mediation of L are partially supported by results.