Hjalmar (Jalmari) Rötkö (13 August 1892, Suomenniemi - 19 July 1938) was a Finnish labourer and politician.
He was a member of the Parliament of Finland from 1929 to 1930, representing the Socialist Electoral Organisation of Workers and Smallholders (STPV).In 5 July 1930, Rötkö and Eino Pekkala were kidnapped by the fascist Lapua Movement.