INTRODUCTION: AS A RESULT OF THE CONFLICT OF EURASIA AND ARABIAN PLATE IN NORTHWEST OF INDIAN OCEAN, MAKRAN SUBDUCTION ZONE (MSZ) HAS BEEN FORMED IN VICINITY OF SOUTHERN COASTS OF IRAN AND PAKISTAN. THE COLLECTED INFORMATION ACHIEVED BY HISTORICAL EVENTS AND REGIONAL SEISMICITY SHOWS THAT COSEISMIC TSUNAMIS IN THE MSZ HAVE REPEATEDLY HAPPENED IN THE PAST AND THEIR OCCURRENCE IN FUTURE ARE PROBABLE. THUS, THE HAZARD OF TSUNAMI FOR COAST OF IRAN IN OMAN SEA IS RELATIVELY HIGH. IN THIS PAPER USING A FULLY NONLINEAR BOUSSINESQ MODEL, PROBABLE TSUNAMIS CAUSED BY MSZ EARTHQUAKES HAS BEEN SIMULATED AND THEIR EFFECT AND PROBABLE FOLLOWING RUN-UP ON CHABAHAR BAY’S COASTS, MOST IMPORTANT AND POPULATED REGION OF IRANIAN COASTS IN OMAN SEA, HAS BEEN INVESTIGATED.