Tripura, a Northeastern state of India, belongs to Brahmaputra subzone 2c from hydrologic point of view. The present work focuses on the estimation of peak flows in Gumti, Manu-Deo, Khowai, Muhuri, Dhalai, Juri, and Haora rivers of Tripura, India. Use of synthetic unit hydrograph formulations applicable for adjacent hydrologic locations is attempted to determine the synthetic unit hydrographs for these seven major rivers of Tripura. A 72-h rainfall event that produces varying total rainfall in three particular river zones are chosen and used to determine the peak flows in these seven major rivers considering zonal spread uniformity. The rainfall runoff coefficient for Gumti river is assumed to remain valid for all rivers because of hydro-geo-morphologic similarity of the state. The peak discharges are obtained by convolution of the derived 1-h unit hydrograph. The derived unit hydrographs and peak discharges can be used further to study the hydraulic characteristics of these seven major rivers of Tripura by future researchers.