Villem Grünthal-Ridala, born Wilhelm Grünthal (30 May 1885 in Kuivastu, Muhu, Kreis Ösel, Governorate of Livonia – 16 January 1942 in Helsinki, Finland) was an Estonian poet, translator, linguist and folklorist.

From 1910 until 1914, he edited Estonian Literature magazine (Eesti Kirjandus), as well as Üliõpilaste leht from 1914 to 1916.

From 1923 until his death, Grünthal-Ridala was professor of Estonian Language and Literature at the University of Helsinki.

His epic Toomas ja Mai (1924), as well as a collection of ballads, Sinine kari (1930), served as a model for the Estonian poetry of the time.

The poems are influenced by Impressionism, with the landscapes of his island homeland and life by the sea being the primary motifs.