The 2nd Congress of the Russian Social Democratic Labour Party was held during July 30–August 23 (July 17–August 10, O.S.) 1903, starting in Brussels, Belgium (until August 6) and ending in London.
Kongres Partai Buruh Demokrat Sosial Rusia ke-2 diadakan pada 30 Juli–23 Agustus (17 Juli–10 Agustus pada Kalender Julian) 1903, yang dimulai di Brussels, Belgia (sampai 6 Agustus) dan berakhir di London.