Oskari Brynolf Reinikainen (1 December 1885, Parikkala – 12 November 1969) was a Finnish physician and politician.

He served as Deputy Minister of Social Affairs from 12 March 1937 to 1 December 1939.

Reinikainen was a Member of the Parliament of Finland from 1919 to 1945, representing the Social Democratic Party of Finland (SDP).

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