LTThis article aims to present the most relevant provisions and principles of European Union legislation concerning social security law, its influence on Lithuanian national law, and how it is reflected in Lithuanian social security law. [Iš leidinio]Reikšminiai žodžiai: Europos Sąjungos teisė; Socialinio saugumo institucijos; Valstybinės pensijos; Profesinės pensijos; European Union legislation; Social security systems; State pensions; Occupational pensions.