Jaguars are the worlds strongest cat I am a scientist most people would think that tigers or lions are but the jaguar has the most muscle most power and is the 3rd largest cat in the world there have been recorded fights and the jaguar has killed the worlds strongest tiger Siberian tiger and the worlds strongest lion African lion in fights over the past years so jaguars have the most power the most muscle and is the 3rd largest cat in the world and is the strongest and most powerful cat in the world ok.