| Type: | bishop |
| Honorific-Prefix: | Mar |
| Thomas Tharayil | |
| Bishop of Kottayam | |
| Archdiocese: | Syro-Malabar Catholic Archeparchy of Kottayam |
| See: | Kottayam |
| Appointed: | 9 June 1945 |
| Term Start: | 8 January 1951 |
| Term End: | 5 May 1974 |
| Predecessor: | Mar Alexander Choolaparampil |
| Successor: | Mar Kuriakose Kunnacherry |
| Ordination: | 18 December 1926 |
| Consecration: | 7 October 1945 |
| Consecrated By: | Mar Alexander Choolaparampil |
| Birth Date: | 1899 5, df=yes |
| Birth Place: | Kaipuzha, Kerala, India |
| Death Place: | Thellakom Kottayam, India |
| Nationality: | Indian |
| Previous Post: | Headmaster, S.H. Mount High School, Kottayam |
| Alma Mater: | Propaganda College, Rome |
| Motto: | Omnes Unum Sint |
Thomas Tharayil (5 May 1899 – 26 July 1975) was an eparchial bishop of the Knanaya Catholic Eparchy of Kottayam, belonging to the Syro-Malabar Church. He was born in Kaipuzha, India. He is buried in Christ the King Cathedral Kottayam.