Kurunthogai, a classical Tamil poetic work, is the second book of Ettuthokai, a Sangam literature anthology. Kuruntokai contains poems dealing with matters of love and separation content matter and were written by numerous authors. Nachinarkiniyar, a Tamil scholar living during the sixth or the seventh century C.E. has annotated this work.
A beautiful poem from Kurunthogai is the famous Red earth and pouring rain by the Sangam age poet Sembula Peyaneerar. This poem is the verse 40 in the Kurunthogai anthology.