Rózsika Rothschild (born Rózsika Edle von Wertheimstein; 15 October 1870 in Nagyvárad, Austria-Hungary – 30 June 1940 in London) was a tennis player and the wife of the banker and entomologist Charles Rothschild.

[1] She was born as Rózsika Edle von Wertheimstein in Nagyvárad, Austria-Hungary (now Oradea, Romania).

She grew up as one of seven children of an officer of the Austro-Hungarian army, Alfred Edler von Wertheimstein.

The multi-lingual Rózsika was regarded as very interested in politics.

Miklós Bánffy, Hungary’s foreign minister following World War I, later praised Wertheimstein’s intellect, influence and efforts to support Hungary as it struggled to preserve its territories, which he detailed in his memoir The Phoenix Land : Around the turn of the century she was a very well known tennis player and national Hungarian champion.