Juho Oskari Lahdensuo (22 June 1864 – 3 July 1935; surname until 1906 Lagerstedt) was a Finnish farmer and politician.
He was a Member of the Diet of Finland from 1904 to 1905.
Lahdensuo was a Member of the Parliament of Finland from 1910 to 1919, representing the Agrarian League.
He was the son of Fredrik Vilhelm Lagerstedt and the elder brother of Jalo Lahdensuo.
This article about a Centre Party (Finland) politician is a stub.