Geographical Information System (GIS) is a very powerful technique which is used in solving different problems in various fields dealing with spatial information. It can also be used for analyzing wars and campaign. Today&amp / #8217 / s modern armies use GIS effectively for different purposes such as determining strategic points and planning attack and defense. GIS can also be used for past wars, and historical GIS includes these kinds of applications. In this study, GIS have been used for analyzing Gallipoli Campaign in the First World War. This campaign started in February on 1915 and Allied troops left the Gallipoli Peninsula on 9th January 1916. Gallipoli Campaign have very important role in Turkish and World history. This study includes two different parts about Gallipoli Campaign. In the first part, selected battles of the campaign are analyzed with different GIS functions. Selected battles are Naval, Ariburnu, Conkbayiri, and 2nd Kirte Battles, and they are selected based on the availability of graphic and attribute data. In the second part, relationship between martyrs and locations are studied. Distributions of the number of soldiers for different criteria, such as province, district, soldier rank, death location and age are shown on maps and pie charts.