The Ukrainian and Belarusian Electoral Bloc (, , UBBW) was an ethnic Ukrainian and Belarusian electoral bloc for the 1930 Polish parliamentary election.

History On 30 August 1930, the Ukrainian National Democratic Alliance (UNDO) decided to contest the upcoming 1930 Polish parliamentary election, and reach out to the Ukrainian social democratic parties, the Ukrainian Socialist-Radical Party and Ukrainian Social Democratic Party, with the two parties signing an agreement to establish an electoral bloc on 18 September. Two Belarusian parties also joined the bloc, with the Belarusian Christian Democracy and the Belarusian Syalyanski Sayuz running on its lists. The decision to form a bloc was motivated by the escalating tensions in Eastern Galicia before the election, allowing the UNDO and social democrats to overcome their ideological differences. Participating parties appealed to minorities to vote for the Bloc to defend "national rights and social rights". The majority of seats won by the bloc were won by the UNDO.

Electoral results Sejm Election year # ofvotes % ofvote # ofoverall seats wonGovernment 1930 725,984 6.41 (#4)

Senate Election # ofvotes % ofvotes # ofoverall seats won 1930 434,042 6.39 (#4)

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