Barangay Cogon is one of the biggest barangays in the city of Tagbilaran, in the province of Bohol, Philippines. Located centrally in the city, Cogon overlooks Tagbilaran Bay to the west, to the south, it is bounded by Poblacion 2, to the east by Barangay Dampas and Dao and to the north by Barangay Booy. It has a plain and rolling land terrain. The highest point of elevation is only 180 feet above sea level.

The total land area is 204.4508 hectares, with a population in 2007 of 17,266, the most in the city. It is generally believed that more than one-half of its present population are no longer native Cogonhanons.

Many years ago, the place was a vast plain of land with few houses, two roads and a little vegetation including the balite tree and Cogon grass. At that time, the grass was useful to people as the leaves were used for roofing their houses. Once a Spaniard asked a native what the name of the place was. The native did not understand Spanish and believed he was asking what the grass was called, so the owner of the hut answered "Cogon". This became widespread as the local place name.^{[citation needed]}