Thomasine Doreen Sansoni (11 October 1911 – 22 June 1977) was a Sri Lankan tennis player and national No.

In April 1933 she reached the semi-finals of the national championships played at the Hill Club in Nuwara Eliya.

[6] In December 1945 she won the singles title at the Bengal Championships in Calcutta, India defeating M. Nolan in straight sets.

She won the doubles title at the 1941 All India Championships in Baroda, partnering with Indian player Khanum Haji.

Her father was Waldo Sansoni,[11] (1883-1966 ), OBE, a former lieutenant colonel commanding the Ceylon Light Infantry regiment,[12] who later became a district judge, [13] and her mother was Thomasin Gertrude Harriet Schrader, (1889-1941) [14] Sansoni had four siblings from her father's first marriage.