This paper reports the results obtained for outdoor gamma dose rates in selected locations in Galati and Tulcea County, Eastern Romania, and Cahul County, Moldova, in the frame of the EU project MIS ETC 1676 referring to assessment of environmental pollution in Lower Danube Euroregion. 50 measurements were carried out in each target site in the period April 2014-May 2015 in localities of Galati county (Galati town, Oancea, Slobozia-Oancea, Vladesti, Vadeni) and Tulcea county (Isaccea, Tulcea), and aquatic ecosystems of Prut river (Galati-Cahul-Gotesti area, Romania- Moldova border), Lower Danube River (Galati-Reni-Isaccea-Tulcea sector), Danube Delta (Tulcea county and Romania-Ukraine border, Chilia branch), and Lake Manta (Cahul county, Moldova). The ambiental gamma dose rate varied with site, day and hour, due to the temporal fluctuations of natural/cosmogenic radioactivity, meteorological conditions, geological substrate and presence of radiation emitted by building materials. The obtained average value of gamma radiation dose rate was 123.2 nGy/h, with a minimum value of 62.5 nGy/h (Danube Delta), and a maximum value of 207.7 nGy/h (Vladesti, Galati County, near a manure field deposit). The results were compared with the official reports for external gamma dose and with the respective annual average values Romania and Moldova, our results being lower than the awareness limit of 250 nGy/h. Also, it can be noted that the dose rates were in most cases in the normal range of variation given by United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) 2008 Report, which is 52 – 163 nGy/h. The obtained results are an important statistical element for annual evaluation of radioactivity in Lower Danube Euroregion and for national reports and will serve as a base in further investigations and preparation of maps of terrestrial gamma dose rates.