| R. R. Crossette-Thambiah | |
| Honorific-Suffix: | KC |
| Order1: | 18th |
| Office1: | Solicitor General of Sri Lanka |
| Term Start1: | 1950 |
| Term End1: | 1951 |
| Predecessor1: | M. F. S. Pulle |
| Successor1: | T. S. Fernando |
| Birth Date: | 2 February 1897 |
| Alma Mater: | St. John's College, Jaffna |
| Profession: | Lawyer |
| Blank1: | Ethnicity |
| Data1: | Ceylon Tamil |
Robert Rasiah Crossette-Thambiah was a leading Ceylon Tamil lawyer and Solicitor General.
Crossette-Thambiah was born on 2 February 1897.[1] He was the son of T. H. Crossette, principal of St. John's College, Jaffna.[1] He was educated at the St. John's College.[1]
Crossette-Thambiah married Amy Ranita, daughter of S. C. Paul.[1]
Crossette-Thambiah taught at St. John's College for a few years before joining the legal profession.[1] He was called to the bar at Middle Temple on 5 October 1925.[1] [2] He was an advocate of the Supreme Court.[2] He joined the Attorney-General's Department in 1926 as an Additional Crown Counsel.[1] He was promoted to Crown Counsel, Senior Crown Counsel, District Judge and Public Trustee (1945).[1] [2] He was then Commissioner of Assize for four years.[1] He became a King's Counsel in 1949.[2] [3] He was Solicitor General between 1950 and 1951.[1] [4]