Partai Demokrat Sosial Lituania (bahasa Lituania:Lietuvos socialdemokratų partijacode: lt is deprecated , LSDP) adalah sebuah partai politikkiri tengah[1] dan demokrat sosial[2] di Lituania. Partai tersebut adalah partai yang paling lama berdiri di Lituania, yang didirikan sebagai organisasi Marxis bawah tanah pada 1896. Pada periode pendudukan Soviet, partai tersebut terpaksa mengasingkan diri, dan kembali ke Lituania pada 1989.
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