Juhanon Mar Thoma Metropolitan (Mar Thoma XVIII) (7 August 1894 – 27 September 1976) was the Head of the Mar Thoma church from 1949–1976, who gave leadership to the church and at the same time actively participated in social and political arenas.
He was respected by people from all walks of life, from all religions and from all age groups.
He is remembered for providing the church with the motto Lighted to Lighten.
"The Church must be interested where human life is interested," was his motto.