Abstract. Security of gas supply in selected UE countries and gas crisis of 2009 Europe’s energy security and Polish perspective. Energy security lies at the heart of energy policy of European Union member states. Main reason for that is connected with countries dependence on Russian gas supplies. This topic became an issue of not only practical but also of scientiÞ c concern. The example of 2009 gas crisis showed how energy security differs among European Union member states. Gas supply disruption countries’ strengths and weaknesses, which inß uenced the range and depth of disruption’s results. Paper compares 2009 situation of selected European Union member states during the gas supply disruption.