Kalathil is a name found in India. It can be a masculine given name or a surname. It could refer to:
As a given name
Kalathil Makki Divakaran, an Indian poet and folk songwriter
As a surname
Jayasree Kalathil, an Indian writer, mental health researcher, and activist Sathish Kalathil, an Indian filmmaker Shanthi Kalathil (born 1972), an American journalist