Onni Aleksanteri Tuomi (21 November 1875 – 4 January 1933; original surname Ahlbom) was a Finnish journalist and politician, born in Virrat.
He was a member of the Parliament of Finland from 1908 to 1918, representing the Social Democratic Party of Finland (SDP).
During the Finnish Civil War of 1918, he was a member of the Central Workers' Council of Finland, the legislature of the Finnish Socialist Workers' Republic.
After the defeat of the Red side, he went into exile in Soviet Russia.
[1] This article about a Social Democratic Party of Finland politician is a stub.