A Diploma Thesis titled “Investigation of the effect of tourism on road accidents” was presented by Vasileios Bellos in November 2017. The objective of this Diploma Thesis is to investigate the effect of tourism on road accidents. For this purpose, data on road accidents in Greece for the five-year period of 2011-2015 were collected. Negative binomial regression models were developed and it was observed that both the tourist season and tourism as travelling purpose led to an increase in road accidents, with the highest increase being observed in tourist regions. The increase of the relative rate ratio of road accident involvement for foreign tourists in tourist regions may indicate the increased risk of foreign tourists compared to Greek drivers.